SPECIFICATONS FOR(Classified)ADDITIONAL 2ND FLOOR OFFICE BLDG

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-05613A000300070002-6
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 66
• Document Creation Date: November 11, 2016
• Document Release Date: June 24, 1999
• Sequence Number: 2
• Content Type: REPORT

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25X1A
SPECIFICATIONS
FOR
2ND FLOOR OFFICE BLDG
25X1A
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1.
Statement of Work
1-01-02
Page o
2
2.
Concrete
2-01-15
3.
Masonry
3-01-05
4.
Carpentry
4-01-07
5.
Terrazzo
5-01-05
6.
Calking
6-01-02
7.
,oofiang and Waterproofing
7-01-05
8.
Plastering
8-01-03
9.
Painting
9-01-04
10.
Hardware: Builders'
10-01-02
11.
Miscellaneous :;::etal
11-01-03
12.
Glass and Glazing
12-01-02
13.
Electrical 'V7orL, Interior
13-01-05
14.
Plur..abing
14-01-04
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STl~TL.: dT OF WO c3
25X1A
SCOPE, OF WORK
The worts covered by this specification consists in furnishing all
plant, labor, eq-,ai .3; :e it, appliances and :daterials and in perforciing all
operations in connection with the construction of an additional second
floor office building, with terrazzo floor, rib concrete roof and
supporting utilities including lighting and plumbing in strict accordance
with this specification and the applicable drawings, and subject to the
terms and conditions of the Contract.
In general the work consists:
a. Constructing the additional second floor and supporting utilities.
b. PatcniaL" aIId repairing the existing walls and ceilings.
c. Painting the existing down spout pipes as to catch the new drain
p ipes.
d. Spraying of shotcrete on the exterior of existing wall as to watch
the new wall of second floor.
e. Repairing and patching the walls and windows of the existing machine
room,
f. removing the partition wall of existing roori No.101 and repairing
and patching the walls and ceiling damaged.
g. ,oroving the existing roofing 3aterials.
di. remodelling; the existing entrance door head.
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03 S11Ci D1 VWPNTGS: The Contractor shall subazit to the Contracting
Officer for approval six (6) copies of all shop drawings as called for
under the various hew,dings of these 2-,)ecifications. These drawings shall
be complete and shall contain all required detailed information. If
approved by the Contracting Engineers each copy of the drawing will be
identified as having received such approval by being so stamped and dated.
The Contractor shall make any corrections required by the Contracting '
Officer. Four (4) sets of all shop drawings will be retained by the Con-
tracting Engineer and two (2) sets will be returned to the Contractor. The
approval of the dra;rings by the Contracting Engineer shall not be construed
as a complete check but will indicate only that the general method of
construction and detaili ag is satisfactory. Approval of the drawings will
not relieve the Contractor of the responsi-biii
y for any error ror which ,y
exist, as the Contractor s :till be responsible for the dimensions and design
of adeq:.oate connections, details, and satisfactory construction of all
work. Materials delivered to Abe site before approved shop drawings have
been returned to Contractor will be rejected by the Contracting Engineer.
04 CLEA'ANINC-UP: The Contractor shall, at all times, keep the con
struction area, including storage areas used by him:, free from accuamula-
tions of waste material or rubbish and prior to completion of work, rednove
any rubbish from about the premises, and all tools, equi pent, and mate--
rialy not the property of the Owner. Upon completion of the construc--
tion, the Contractor shall leave the work and premisseo in a clean, neat
and workmanlike condition satisfactory to the Coni%racting Engineer.
05 PECIF.ICATlt;N . . A N N E Li 1I.NG The Contractor shall keep on the work
a copy of the drawing; and specifications and shall at all times give
the Contracting; Engineer access thereto. Anything senti onaed in the specifi-
cations and not shown on the drgwin.s, or shown on the drawings and. not
mentioned, in sp ecif ic1.tioY s,. shall be of like effect as if shown or mentioned
in both. In case of di f.'erence between ? rawings and spe i is a :onns, the
specifications shall govern. In any case o".' discrepancy either in the
fi -
ures, in the drawings, or in the specific dons, the matter shall be proa%.Aly
suh`ni Lted to the Contracting Engineer, who f3 3 :' pro:saptly wade G C 'v' 1" 3 YnE;-
tion in writing. Any adjust :ent by the Contractor without this def eb .; aa-
tion Shall be at hi~_. ow31 risk and expense. i T C~r
.,, ..e 5.~o i:+rtMetin~-,- ti'
.~nci?!. c:', r "0a,~i.y
furnish fro tine to ,ii-."e su...ch detail drawings and other information as he
may consider necessary, unless otherwise 1~rcvided.
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CONCRETE
01 SCOPE:
Furnish all plant, labor, equipment, appliances and materials,
and in pefform all operations in connection with the installation of
concrete work, complete., in strict accordance with this section of the
specifications and the applicable drawings, and subject to the terms and
conditions of the contract.
02 GENERAL :
Full cooperation shall be given other trades to install embedded
items. Suitable templates or instructions, or both., will be provided for
setting items not placed in the forms. Embedded items shall have been
inspected, and tests for concrete and other materials or mechanical opera-
tions shall have been completed and approved before concrete is placed.
03 MATERIALS:
a. Quality requirements for materials listed herein are based
on U.S. Federal Specifications. However, the use of products of reputable
25X1A manufacturers is intended where equivalent to the materials speci-
fied, subject to the approval of the Contracting Engineer,
b. reate: Both coarse and fine aggregate? except for
gradation, limit of absorption, and sources of materials, shall Conform
to the requirements of Federal Specification SS-A-281b. Limit of absorp-
tion shall not exceed 5 percent. The maximum size of,coarse aggregate
shall be not larger than one-fifth of the thickness of the member nor
larger than three-fourths of the minimum clear spacing between reinforc-
ing bars.
(1) General: Coarse and fine aggregate shall consist
of crushed river gravel and screenings, or other approved granular
materials of similar characteristics, and shall be composed of hard,
tough,, durable and uncoated particles. The equipment and plant used
in the production of coarse and fine aggregate shall be designed for the
aggregate conforming with the requirements of these specifications.
Dust shall be removed by adequate washing. The particle shape of the
smallest size of crushed coarse and fine aggregate shall be generally
rounded or cubical,, and the tolerance of flat and elongated particles in
all sizes of the coarse and fine aggregate shall be governed by the
inherent, placeability requirements of the structure in which the mixture
is to be placed. Rock which breaks down into thin,, flat, elongated
particles, regardless of the type of pr*,o.:,essing equipment used, , will not
be approved for use in the production of coarse and fine aggregate. A
thin, flat and elongated particle is defined as a particle having a
maximum dimension greater than five (5) times the minimum dimension.
Aggregate shall not be manufactured from rock which is subject to
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weathering or disintegration when exposed to air or moisture nor from
rock containing opaline or other active manerals.
(2) Coarse and fine aggregate: Coarse (Types I & V)
and fine (Types II & III) aggregate shall be well graded from fine to
coarse and shall be within the grading limits shown in the following
table:
Screen Sizes
Inches)
Table of Grading Limits
Percent by Weight Passing
e I Type II Type III # pe V
2 100
1-1/2 . . 95-100
1 ? 20- 55 ?
? ? ? ? ? ? ? ? ?
100
3/4 ? 0- 15 .
? ? . . ? ? . . . . .. .
95-100
1/2
3/8 - C-- -5-
.
..
-100 ? ? . . . ? ? . .
20- 55
No. 4 ? ? . ? ? ?
.
95-100 . . . . ? . ? ? ?
o- 15
No. b
65- 90 ? ? 100 ? . .
0-. 5
No. 16
45- 70 . ? 9 5-100 . . . .
?
No. 30 ? . . ? ? ? ?
?
2 5- 45 ? ? . 40- 70 ? ? ? ?
? ? ?
No, 50
No. 100 ? ? ? ?
2- 8 ? . 0- 25 ? ? ? ?
? ?
Na. ')Cr ? ? 0- 2 ?
0 - 4 ? ? 0- 5 . . .
o- .2
# Type III aggregates are for mortar and
plaster.
d. Anchorage items: Slots. and inserts for anchoring
masonry and mechanical items to concrete shall be of standard local
manufacture, of types required to engaged with the anchors to be pro-
vided and installed therein under other sections of these specifications,
and shall be subject to approval,
30--pound.
e?_ Asphalt-saturated felt: Federal Specification HH-F-19l,,
f. Cement: Only one brand of cement shall be used for
exposed concrete in any individual-Structure. Cement reclaimed from
cleaning bags or leaking container shall not be used. Cement shall be
used in the, sequence of receipt of shipment, unless otherwise directed.
Portland cement shall conform to Federal Specification SS-C192b, Type I.
g. Curing materials:
the purpose. .
(1) Waterproof 12a22r: Federal Specification uu-P-264a,
(2) Mats: Commercial quality of type best suited to
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(3) Burlap: Commercial quality.
h. Forms: Wood, metal, structural hardboard, or other
approved material that will not adversely affect the surface of the
concrete and that will produce or facilitate obtaining specified sur-
face finish of the concrete.
or better lumber.
(1) Wood;
(a) Unexposed concrete surfaces: No. 2 Common
(b) Exposed concrete surfacesf Dressed-and-
matched boards of uniform thickness, and width not exceeding 10 inches.
(c) Rubbed or smooth surfaces: Plywood or with
linings as specified below,
(2) Plywood: Commercials-Standard Luan moisture-
resistant, concrete-form p ywood, not less than 5-ply and at least
9/16 inch thick,,
(3) Metal Forms:. Approved type that will produce
surfaces equal to those specified for wood forms.
(4) Hardboard formsi A hard-pressed fiberboard conform-
ing to Federal Specification LLL-F 311, especially treated for concrete-
form use, not less than 1/1.-inch thick,
(5) Form lining:
(a) Plywood: Commercial-Standard Luan, concrete-
board having a low degree of water a sorptivity, not less than 3/16
inch thick, with one smooth side,
i. Form oil: An approved colorless (not darker than ASTM
No., 3 in accordance wl.trh Method 102.5 of Federal Specification
VV-L-791d) mineral oil, free from kerosene, with a viscosity of not
less than 70 not more than 110 seconds (Saybolt Universal) at 100?F.,
except that when used on hardboard forms the viscosity shall be not
less than 250 seconds at 100?F. Flash point shall be not less than
300?F. (open cup). Viscosity and flash point shall be determined in
accordance with methods 304.6 and 1103..5,. respectively,. of Federal
Specification VV -L-791d.
J . Form sealer: Federal Specification TT-W-572,.
k., Form ties: Of approved design,. fixed or adjustable in.
Length, free of devices that wi.l,l leave a hole larger than 7/8 inch
in'diameter in surfaces of concrete, and when used where discoloration
of the concrete would be objectionable, metal one inch from the finished
surface,
1., Mesh reinforcement: ASTM Standard A 185-54T. except as
specified otherwise hereinafter.. When, indicated in slabs on fill, mesh shall
be of the. sizes indicated, and gage shall be Americal steel wire gage.
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a. Reinforcement:.
(1) Deformed bars: Federal Specification QQ-B-71a,
Type B, Grade II, structural grade billet steel, except as otherwise
noted on the drawings.. Deformations shall conform to ASTM.
shall accompany deliveries oflreinnfforcingcsteel, es d ofsh mill ninn-reports
forcemeat,
no Water shall be clean, fresh and free from injurious
amounts of mineral and organic substances.
o. Cinders shall be clean and well burned anthracite
cinders, containing not less than 90% clinkers..
04 SAMPLES AND TESTING;
as General: Testing of the aggregate, reinforcement,
cement and end items shall be the responsibility of the Owner.
Samples of concrete for strength tests of end items shall be provided
and stored by the Contractor when and as directed.
Specification SS-C-192b,eand shallnbessampled eitherr at the smillbeorln Federal
at the site of the work. Tests will be made by or under the supervision
of the Contracting Engineer at the expense of the Owner. No cement
shall be used until notice has been given by the Contracting Engineer
that the test results are satisfactory.. Cement which has been stored
other than in the bins at the mills, for more than 4 months, after
being tested, shall be retested before use. Ordinarily, no cement
shall be used until it has satisfactorily passed both the 7 and 28-day
tests; but in cases of urgency the Contracting Engineer may waive the
2S-day tests and permit the use of cement which has satisfactorily
passed the chemical, soundness and 7 days tests, provided it is the
product of a quarry and mill which have established a reputation of
not less than 3 years: standing for the production of high-grade cement.
Any cement delivered at the site of the work and later found under tests
to be unsuitable shall be removed from the work and its vicinity.
Co. AZg~ re gate: Aggregate shall be to ted as prescribed in
Federal. Specification SS-A-281b. In addition, fine aggregate shall be
tested for organic impurities in conformance with ASTM Standard C 40-4S.
d. Reinforcement: Reinforcing bars shall be tested as
prescribed in Federal Specification QQ-B-7la. Mesh reinforcement shall
be tested as prescribed in ASTM Standard A 155-54T.
ILLEGIB e. Concrete:
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(1) Strength tests during the work: The Contractor
shall provide for test purposes one set of three cylinders taken from
each 250 cubic yards or fraction thereof, or each day's pour, whichever
is less, of each class of concrete placed. Test specimens shall be
made and cured in accordance with ASTM Standard C 31-55. Specimens
shall be cured under laboratory conditions except thzt the Contracting
Engineer may require curing under field conditions. Cylinders shall.be
tested in accordance with ASTM Standard C39-49. The test result shall
be the average of the strengths of the three cylinders, except that
if one specimen in a test shows manifest evidence of improper sampling,
molding or testing, the test result shall be the average of the
remaining two specimens. If two specimens show such defects, the test
shall be discarded. The standard age of tests shall be 28 days, but
7 day tests may be used, with the permission of the Contracting Engineer,
provided that the relation between the 7 day and 28 day strengths of the
concrete is established by tests for the materials and proportions used.
If the average of the strength tests of the laboratory control specimens
for any portion of the work falls below the minimum allowable compressive
strength at 28 days required for the class of concrete used in that
portion,. the Contracting Officer shall have the right to order a change
in the proportions of the concrete, or both, for the remaining portions
of the work, at the Contractor's expenses. If the average strength of the
specimens cured on the job falls below the minimum allowable strength,
the Contracting Engineer may require changes in the conditions of
temperature and moisture necessary to secure the required strength.
(2) Tests of hardened concrete in, or removed from, the
Structure= Where there is question as to the quality of the concrete
ni the structure, the Contracting Engineer may required tests in accordance
with ASTM Standard C 42-45 or other load tests for that portion of the
structure where the questionable concrete has been placed. When required,
the load tests shall be made, at the Contractor's expense, in accordance
with section 202 of the ACI Building Code (ACI 318). In the event that
load tests indicate that concrete placed does not conform to the drawings
and these specifications, measures as proscribed by the Contracting
Engineer shall be taken to correct the deficiency at no additional cost
to the Owner.
05 STORAGE:
a. General: Storage accommodations shall be subject to
approval and shall afford easy access for inspection and identification
of each shipment in accordance with test reports.
b. Cement: Immediately upon receipt at site of work, cement
shall be sotre in a dry weat hertight, properly ventilated structure,
with adequate provision for proventation of absorption of moisture.
C. Aggregate : Storage piles of aggregate shall afford
good drainage, preclude inclusion of foreign matter, and preserve the
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gradation. Sufficient live storage shall be maintained to permit seggre-
gation of successive shipments; placement of concrete at required rates,
and such procedures as heating, inspection and testing.
06 FORMS:
a. General: Forms, complete with centering cores and
moldy, shall be constructed to conform to shape, form, line and grade
required, and shall be maintained sufficiently rigid to prevent defor-
mation under load. Studs shall be spaced sufficiently close to prevent
deflection of form material and consequent waviness in surfaces of
concrete,
b. Design: Joints shall be leakproof and shall be arranged
vertically or horizontally to conform to the pattern of design. Forms
placed on successive units for continuous surfaces shall be fitted to
accurate alignment to assure a smooth completed surface free from irre-
gularities. In spans where intermediate supports are not possible, the
anticipated deflection in the forms due to weight of fresh concrete
shall'be accurately figured and taken into account in the design of the
forms, so that finished concrete members will have true surfaces
conforming accurately to desired lines, planes and elevations. If
adequate foundation for shores cannot be secured, trussed supports
.shall be provided. Temporary openings shall be arranged in wall and
column forms and where otherwise required to facilitate cleaning and
inspection. Lumber once used in forms shall have nails withdrawn and
.surfaces to be exposed to concrete carefully cleaned before reuse.
Forms shall be readily removable without hammering or prying against
the concrete.
c. Form ties shall be of suitable design and adequate
strength for the purpose; Wire ties will not be permitted where dis-
coloration of the finished surface would be objectionable. Bolts and
rods which are to be completely withdrawn shall be coated with grease.
d. Joints: Corners of columns, girders and beams and
other exposed joints in more than one plane, unless otherwiee indicated
on the drawings or directed, shall be beveled, rounded or chamfered by
moldings placed in the forms.
e. Coating: Forms for exposed surfaces shall be coated
with oil before reinforcement is placed. Surplus oil on form surfaces
and arty oil on reinforceing steel shall be removed. Forms for surfaces
not exposed to view or normal weathering may be thoroughly wet with
water in lieu of oiling inmiediately before placing of concrete. Wood
forms for concrete that is to be painted shall be coated with sealer
instead of with oil or water. Sealer shall be a water-repellant wood
preservative conforming to Federal Specification TT-'~ -572.
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f. Removal: Forms shall be removed only with approval of
the,Contracting Engineer and in a manner to insure complete safety of the
structure after the following conditions have been met. '.1iere the
structure as a whole is supported on shores, the beam and girder' sides,
columns and similar vertical forms may be removed after 24 hours,
provided concrete is sufficiently hard not to be injured thereby.
Supporting forms or shoring shall to support safety their weight and any
construction and/or storage load to which they may be subjected but in
no case shall they be removed in less than 6 days, nor shall forms used
for curing be removed before expiration of curing period except as
'hereinafter provided under curing. Care shall be taken to avoid spalling
the concrete surface. Wood forms a'shall be removed comp'-etely from
under steps and similar dead spaces, thorough temporary opening if
necessary.
(1) Control tests: Results of suitable control tests
will be used as evidence that concrete has attained sufficient strength
to permit removal of supporting forms. Cylinders required for control
tests shall be provided in addition to those otherwise required by this
specification. Test specimens shall be removed from molds at the end
of 24 hours and stored in the structure as near points of sampling as
possible, shall receive insofar as practicable the same protection from
the elements during curing as is given these portions of the structure
which they represent, and shall not be removed from the structure for
transmittal to the laboratory prior to expiration of three-fourths of
the proposed period before removal of forms. In general, supporting
forms or shoring shall not be removed until strength of control-test
specimens has attained a value of at least 1,500 pounds for columns and
2,000 pounds for all other work. Care must be exercised to assure that
the newly unsupported portions of the structure are not subjected to
heavy construction or material loading.
(2) Clamps: Tie-rod clamps to be r_-,moved entirely
from the wall shall be loosened 24 hours after concrete is placed, and form.
ties, except for a sufficient number to hold forms in plac3, may, be removed
at that time. Ties wholly withdrawn from walls shall be pulled toward
inside face.
(3) Filling tie-rod or bolt holes: Holes left by
bolts or tie rods shall be M led solid within 12 hours after removal of
forms, with cement mortar blended to match adjacent surface. Holes
passing entirely through walls shall be filled from inside faces, using
a stops held at the cutside wall surface to insure complete filling.
Holes which do not pass entirely through walls shall be packed full.
Excess mortar at faces of filled holes shall be struck off flush,
07 REINFORCING STEEL:
a. General; Reinforcing steel, fabricated to shapes and
dimensions shown, shall be placed where indicated on the drawings or
required to carry out the intent of drawings and specifications.
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Before being placed, reinforcement shall be thoroughly cle e d of
rust, mill scale or coating that would reduce or destroy the bond.
Reinforcement reduced in section shall not be used. Following any
substantial delay in the work, previously placed reinforcement left
for future bonding shall be inspected and cleaned. Reinforcement shall
not be sent or straightened in a manner injurious to the material.
Bars with kinks or bends not shwon on drawings shall not be placed. The
heating of reinforcement for bending or-straightening will be permitted
only if the entire operation is approved by the Contracting Engineer.
In slabs, beams and girders, reinforcement shall not be spliced at
points of maximum stress. Laps or splices shall be of adequate length
to transmit stresses and, unless otherwise indicated, shall conform to
the table in ACI 315-21. Splices in adjacent bars shall be staggered4
Splices in columns, piers and struts shall be lapped sufficiently to
transfer the full stress by bond.
b. Design and details: Unless otherwise indicated on
the drawings, the design of reinforced concrete structures shall conform to
ACT 318-56 and the details of reinforcing steel shall conform to ACI
315-48. Unless otherwise shown or specified, construction shall conform
to the following requirements:
(1) Concrete covering over steel reinforcement
shall be not less than the following thicknesses:
Footings and other principal structural members in
which concrete is deposited against the
ground . . . . . 3 inches between steel and ground
Where concrete surfaces, after removal of forms,
are exposed to weather or ground:
For bars more than 5/8 inch in diameter . . . 2 inches
For bars 5/8 inch or less in diameter . . . . li inches
Where surfaces are not directly exposed to weather
or ground:
For slabs and walls . . . . . . . . . 3/4 inch
For beams, girders, and tied colu ns. 12 inches
All covering .,. ..; Equal to diam.
of round bars.
Exposed reinforcement bars intended for bonding with future extensions
shall be protected from corrosion by concrete or other adequate covering.
(2) Stirrup s acer bars: All stirrups, except
ties, shall be held in place by two 3/8-inch spacer bars extending full
length of that portion of the beam or girder occupied by stirrups.
(3) ShoEddrawingss: Shop details and placing drawings
for all reinforcing, steel shall be furnished for approval.
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c, Supports: With the exception of temperature rein-
forcementwtbich. shall be tied to main steel approximately 24 inches
in center, reinforcement shall be accurately placed and securely tied
at all intersections and splices with 1S--gage black annealed wire, and
shall be securely held in position during.the placing of concrete by
spacers, chairs or other approved supports; Wire-tie ends shall point
away from the form. Unless otherwise indicated on the drawings or
specified, the number, type and spacing of supports shall conform to the
ACT Detailing Manual (ACI 315-21).
08 CLASS OF CONCRETE AND USAGE:
a. Strength requirements: Concrete required shall be,
proportioned and mixed for the fo'lowing strength:
Class of Minimum allowable compressive
Concrete Strength at 28 Days
A 3,000 psi
Usage
All reinforced concrete
b. Cinder conccete shall be 1 part portland cement ASTM
C-150, Type II, 2 parts sand, and 5 parts cinders.
09 PROPORTIONING OF CONCRETE MIXES:
a. General: Concrete shall be proportioned by weight..
b. Measurements:
(1) Cement: A one-cubic-foot bag of portland cement
will be considered as 94 pounds in weight. In determing the approved
mix, portland cement will be used alone as the cementitious material.
as,6.33 pounds.
(2) Water: One gallon of water will be considered
(3) Aggregate: Fine and coarse aggregate shall be
measured by weight in accordance with Federal Specification AA-A-281b.
Coarse aggregate shall be used in the greatest amount consistent with
required workability.
c. Corrective additions to remedy deficiencies in aggre-
gate gradations shall be used only with t e written approval of the
Contracting Engineer. When such additions are permitted, the material
shall be measured separately foreach batch of concrete.
d. Control: The design of concrete mixture, to meet
strength requirements of the, class or classes of concrete specified,
shall be-the- responsibility of the Contractor. No substitutions
shall be made in the materials used in the work without the approval
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of the Contracting Engineer. Average cement content and maximum water
per bag of cement shall be as follows:
Class of Concrete Average Cement Content Maximum Gal of Water
Bags of Cement per Cubic Yard Per Bag of Cement
A
3,000 pounds per
square inch 5.5 6
(1) Slump test: Consistency will be determined by
the slump test. The slump shall be 3 inches minimum and 3 inches maximum
for vibrated concrete. When placing of concrete without vibration is
approved, slump shall be from 3 to 6 inches.
(2) Mix proportions: Preliminary mix proportions
will be furnished the Contracting Hngineer by the Contractor before
start of operations. Adjustment will be made by the Contracting Engineer,,
as required, to determine final proportions which will best satisfy job
requirements and use of materials. Subsequent adjustment in these final
mix proportions shall be made by the Contracting Engineer as required to
compensate for variations in the gradation and moisture content of the
aggregates. Necessary revisions in water-cement ratio and concrete mix
proportions shall be made as directed.
(3) Workability: The consistency of the misture will
be that required.for the specific conditions and methods of placement.
The slump shall not exceed that specified above.
(4) Strength tests: The Contracting Engineer will
determine the strength of the concrete in the completed work during
the progress of construction by test specimens made, cured and tested
as specified herein under SAMPLES AND TESTING, Modifications of the
design mix, if required, will be made by the Contracting Officer on
the basis of the strength of these test specimens. There will be no
additional compensation for changing the proportions of the mix to
overcome field and aggregate deficiencies. or to obtain the specified and
characteristics of the concrete, Adjustment in payment will be made
for cement more or less that the average bags per cubic yard specified
hereinbefore for a given mix.
10 MATCHING AND MIXING:
a. Type of plant: The batching plant and mixing equip-
ment shall be as approved by the Contracting Engineer. Either a manual of
a semi-automatic plant may be used, subject to the approval of the
Contracting Engineer. A manual plant is defined as one in which batch
weights are set manually and materials are batched manually. A semi-
automatic plant is defined as one in which batching weights are set
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manually, mixes are changed manually) and, materials are batched
automatically.
b Eatching_plant:
on-site or off-site.
(1) Location: The hatching plant may be located
(2) Arrangement: Separate bins or compartments shall
be provided for fine aggregate, or the different sizes of coarse
aggregate, and for bulk cements when used. The compartments shall
be of ample size and so constructed that the materials will remain
separate'under all working conditions. 1~ggregates may be weighed
cumulatively in one weigh batcher on one scale in a manual plant
and in a semi-automatic plant may be weighed cumulatively in one
weigh batcher on one scale or in separate weigh batchers with indivi-
dual scales. In a semi-automatic plant, bulk cement shall be weighed
on a separate scale in a separate weigh bat cher. In a manual plant
bulk cement shall be weighed in a separate hopper which may be attached
to a separate scale for individual weighing or may be attached to the
aggregate hopper for cumulative weighing, provided there are separate
beams or dials for cement and aggregates. If cement is weighed on the
same scale as the aggregates the cement shall be weighed first and an
interlock shall be provided to insure that all hoppers are empty and
that the scale is in balance before the weighing of the cement begun.
Water may be measured by weight or by volume. In a smi-automatic
plant, the batching controls shall be so interlocked that a new batching
cycle cannot be started until all batchers are completely empty. The
plant shall be so arranged as to facilitate the inspection of all
operations at all times. Suitable facilities shall be provided for
obtaining representative samples of concrete for uniformity tests.
Delivery of materials from the batching equipment shall be within the
following limits of accuracy:
Cement . . . . . . . . . . 1 pe rcent
Water . . . . . . . . . . 1 percent
Aggregate . . . . . . . . 2 percent
(3) Water batcher: Equipment for batching water
shall be provided at the batching plant or included with the mixer,
as required for the type or plant used. A suitable water-measuring
device shall be provided which will be capable of measuring the
mixing water within the specified requirements for each batch. The
machanism for delivering water to the mixers shall be such that
leakage will not occur when the valves are closed. The filling and
discharge valves for the water batcher shall be so interlocked that
the discharge valve cannot be opened before the filling valve is
fully closed.
(4) Moisture control: A semi-automatic plant shall
be capable of ready adjustment for the varying moisture contents of
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The aggregates and to change the weights of the materials being
batched.
(5) Scales: Adequate facilities shall be provided
for the accurate measurement and control of each of the materials
entering each batch of concrete. The Contractor shall provide
standard test weights and any other auxiliary equipment required for
the operation of each scale or other measuring device. Periodic tests
shall be made in the presence of a Contracting Engineer in such manner
and at such intervals as may be directed.
c. Concrete mixers may be stationary mixers, or paving
mixers of approved design. The mixers shall have a rated capacity
of a least 14 cubic feet of mixed concrete and shall not be charged
in excess of the capacity recommended by the Manufacturer. Mixers
shall be capable of combining the materials into a uniform mixture
and of discharging this mixture without segregation. Stationary and
paving mixers shall be provided with an acceptable device to lock the
discharge mechanism until the required mixing time has elapsed. The
mixers or mixing plant shall include a device for automatically
counting the total number of batches of concrete mixed. The mixers
shall be operated at the drum speed designated by the manufacturer on
the name plate. The mixing periods specified herein are predicated
on proper control of the speed of rotation of the mixer drum, and an
proper introduction of the materials into the mixer. The mixing time
will be increased when such increase is necessary to secure the
required unifomaty and consistency of the concrete, or when test
samples of concrete taken from the front, center and back of the mixer
show a difference of more than 10 percent in sand-cement or water-cement
ratio. Excessive over-mixing requiring a additions of water will not
be permitted. The mixers shall be maintained in satisfactory operating
condition, and mixer drums shall be kept free of hardened concrete.
Mixer blades shall be replaced when worn down more than 10 percent of
their depth. Should any mixer at any time produce unsatisfactory
results, its use shall be promptly discontinued until it is repaired.
(1) Stationary mixers: The mixing time for each
batch:; after all solid materials are in the mixer drum and provided that
all of the mixing water is introduced before one-fourth of the mixing time
has elapsed, shall be not less than 1 minute for mixers having a capa-
city of 1 cubic yard; for mixers of larger capacities, the minimum
mixing time shall be increased 15 seconds for each addition 1-1/2 cubic
yard or fraction thereof of additional concrete mixed. When a stationary
mixer is used for partial mixing of the concrete (shrink-mixed) the
mixing time in the stationary mixer may be reduced to the minimum
necessary to intermingle the ingredients (about 30 seconds). .
Water shall be removed before concrete is deposited.
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Any flow of water shall be diverted through proper side drains and shal_
be removed without washing over freshly deposited concrete. Hardened
concrete, debris and foreign materials shall be removed from interior
of forms and from inner surfaces of mixing and conveying equipment.
Reinforcement shall be secured in position, inspected and approved befe-3
curing of concrete. Runways shall be provided for wheeled concrete-
handling equipment; such equipment shall not be wheeled over reinforce
ment nor shall runways be supported on reinforcement.
12 PLACING CONCRETE:
a. General: No concrete shall be placed in final position
except in the presence of a Contracting Engineer. The use of bait
conveyors, chutes or similar equipment will not be permitted without
written approval. Concrete shall be handled from mixer or transport
vehicle to place of final deposit in a continuous manner, as rapidly as
practicable, and without segregation or loss of ingredients until the
approved unit of operation is completed. Concrete that has attained
its initial set or has contained its mixing water for more than 45
minutes shall not be placed in the work. Placing will not be permitted
when, in the opinion of the Contracting Engineer, the sun, heat, wind or
limitations of facilities furnished by the Contractor prevent proper
finishing and curing of the concrete. Forms or reinforcement shall not
be splashed with concrete in advance of pouring. Concrete shall be
placed.in the forms as nearly as practicable in final position.
Immediately after placing, concrete shall be compacted by thoroughly
agitating in an approved manner. Tapping or other external vibration
of forms will not be permitted. Concrete shall not be placed on
concrete sufficiently hard to cause formation of seams and planes of
weakness within the section. Concrete shall not be allowed to drop
freely more than 5 feet in unexposed work nor more than 3 feet in
exposed work. Concrete be receive other construction shall be scree ded
to the proper level to avoid excessive shimming or grounting.
13 COMPACTION:
Concrete shall be compacted by mechanical internal-
vibrating equipment supplemented by hand-spading, rodding and tamping as
directed. Vibrators shall in no case be used to transport concrete insde
forms. Use of form vibrators will not be permitted. Internal vibrator.,
shall maintain a speed of not less than 5,000 impulse per minute when
submerged in the concrete. At least one spare vibrator or sufficient
parts for repairing vibrators shall be maintained at the site of all
times. Duration of vibration shall be limited to time necessary to
produce satisfactory consolidation without causing objectionable segre-
gation and shall be at least 20 seconds per square foot of exposed
surface. The vibrator shall not be inserted into lower courses that
have begun to set. Where absorptive form lining is used, the vibrator
shall not be placed between the forms and the outer row of reinforcement,
and in no case shall the vibrator be allowed to tough the absorptive
form lining. Vibrators shall be applied at uniformly spaced points not
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farther apart than the visible effectiveness of the machine.
14 BONDING AND GROUTING:
Before depositing new concrete on or against concrete
that has set, existing surfaces shall be thoroughly roughened and cleaned
of laitance, foreign matter and loose particles. Forms shall be
retightened and existing surfaces slushed with a grout coat of neat
cement. New concrete shall be placed before the grout has attained
initial set. Horizontal construction joints shall be given a brush
coat of grout consisting of cement and fire aggregate in the same pro=
portion as concrete to be placed, followed by approximately 3 inches of
concrete of regular mix except that the proportion of coarse' aggregate
shall be reduced 50 percent. Grout for setting column bases, wall
plates and other metal items shall be composed of equal parts of sand
and portland cement; with water sufficient to produce required
consistency%
15 FINISHES OF CONCRETE
a. General: Immediately after removal of the forms all
fins and loose material shall be removed; honeycomb, aggregate pockets,
voids and holes over 1/2 inch in diameter shall be cut out to solid
concrete, thoroughly wetted, brush-coated with neat cement grout, and
filled with cement mortar composed of 1 part cement to 2 parts fine
aggregate. Mortar shall be placed in layers as required, with each layer
being thoroughly compacted in places4 The final layer shall be finished
flush and in the same plane as adjacent surfaces, Patch work shall be
damp cured for 72 hours. Exposed patch work shall be rebbed or otherwise
treated to match adjacent surfaces,
b. Smooth finish shall, in addition to the above, be
given to all concrete surfaces throughout the interior and exterior of
the structure, which are exposed to view in finished work or are to be
pointed.. Smooth finish shall consist in thoroughly wettings and then
brush-coating the surfaces with cement grout composed of 1 part cement to
2 parts fine aggregate (by volume) mixed with water to the consistency of
thick paint. Grout shall be cork or wood floated to fill all pits, air
bubbles, and surface holes. Excess grout shall be scraped off with a
trowel and the surface rubbed with burlap to remove any visible grout film.
In hot, dry weather, the grout shall be kept damp by means of fog spray
during the setting period, The finish for any area shall be completed
in the same day and the limits of a finished area shall be made at
natural breaks in the finished surface.
c. Slabs receiving terrazzo finish: The slabs shall be
finished to tamping the concrete with special tools, then screeding
with straight edges and floating to present a reasonably true and uniform
surface, at an elevation sufficiently below the finished surface elevation,
as indicated on the drawings, so that when the terrazzo is poured,, the
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the finished surface of the terrazzo will be at the elevation indicated
on the drawings. The slabs shall be wood troweled finished to provide
adequate bonding surface.
16 CURING:
a. General: Curing shall be accomplished by preventing
loss of moisture, repid temperature change and mechanical injury or
injury from rain or flowing water for a period of 7 days when normal
portland cement has been used, or 3 day when high-early-strength
portland cement has been used. Curing shall be started as soon after
placing and finishing as free water has disappeared from the surface
of the concrete. Curing of formed undersurfaces shall be accomplished
by moist curing with forms in place for the full curing period, or,
if forms are removed prior to the end of the curing period, by other
means approved by the Contracting Engineer.
b. Moist curing: Unformed surfaces shall be covered with
burlap, cotton or other approved fabric mats,.or with sand, and shall
be kept continually wet. Forms shall be kept continually wet and if
removed before the end of the curing period, curing shall be continued
as on unformed surfaces. Using suitable materials. Burlap shall be
used only on surfaces which will be unexposed in the finished work and
shall be in two layers.
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MASONRY
The work covered by this section of the specifications
consists in furnishing all plant, labor, equipment, appliances and
materials and in performing all operations in connection with the
installation of masonry, complete, in strict accordance with this
section of the specifications and the applicable drawings, and subject
to the terms and conditions of the contract.
02 MATERIALS:
4. General: Quality requirements for materials listed
herein are based on U.S. Federal Specifications. However, the use
25X1A of products of reputable - manufacturers is intended where
equivalent to the materials specified, subject to the approval of
the Contracting Engineer.
b.,, Anchors and ties: Heavily galvanized metal of standard,
types, subject to approval by the Contracting Engineer; furnish and
install as required.
C. Concrete masonry units shall be of modular dimensions,
and shall be made from portland cement and aggregate with or without
the addition of other suitable materials, shall include all closer
and jamb units, and shall be of the sizes and special shapes required
to complete the work as shown. Units shall be of the same manufacturer
and composition for each building, unless otherwise approved. There
units of more than one manufacturer are approved for use in the same
building, the units shall be of similar composition, size and
appearance, and shall be cured by the same process. Units shall
be uniform of surface texture and color; sound and free from cracks,
chipped edges, or other defects that would interfere with their
proper setting or impair the strength, appearance, or durability
of the construction. Units shall conform to ASTM specifications
as noted below except that they shall be free of any deleterious
matter that will stain plaster or corrode metal, shall be adequately
cured before shipment, and shall have a moisture content, at time of
delivery to the building site, of not more than 30 percent of the
maximum percentage of total absorption of the units.
d. Lime: Federal Specification SS-L-351, type M or F, or
SS-L-351, type C, pulverized with the further requirement that the
total free (unhydrated) calcium oxide (CaO) and magnesium oxide (NgO)
in the hydrated produce shall not exceed S pe:-cent by weight, calcu-
lated on the "as received" basis,
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e. Reinforcement:
(1) Horizontal reinforcement shall be of electrically
welded steel wire not less than No. S gage of design shown on drawings.
(2) Vertical reinforcing shall be deformed bars as
specified under Section 2, CONCRETE.
f. Sand: ASTM Specification C 14b-44
g. Water: Clean and free from injuric a.s amounts of oil,
acids., soluble salts, and organic impurities.
h.
Cement:
(1)
Portland cement:
Fed.eri.l Specification SS-C-192,
type I.
(2)
Masonry cement:
Federal. Specification SS-C-181,
type II,
i. Common clay bricks All clay brick shall be best quality,
well burned local common red brick:, not less than 21, x 9!! x 1+1?. No under-
sized brick, broken brick, brick with spawls or fissures will be allowdd.
All brick rejected by the Contracting Officer shall be promptly removed
from the site.
03 SAMPLES:
Before delivery of any material to the site, submit the
following samples to Contracting Officer for approval:
Concrete masonry units . . . . . . , . . 3 units
Horizontal reinforcement section . . . . . 3 foot section
Common clay brick . . . . . . . . . . . . 12 units
04 HANDLING AND STORAGE:
a, Handle masonry units so as to prevent excessive chipping.
Protect concrete masonry units in such manner that t'zeir moisture content
at the time of laying will not be greater thai when delivered to the
project site. Cement, lime, and admixture mane rials shall be stored in
weatherproof sheds, or upon platforms raised above the ground and pro-
tected by tarpaulin covers until used. Cement or other material
hardened or caked by the absorption of moisture will not be permitted
in the work.
b. All clay brick shall be handios in such manner as to
prevent undue chipping and bre kage. Storage piles, stacks or bins shall
be so located as to avoid being disturbed or shall be barricaded to
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protect the materials from damage by construction operation.
c. Cement, lime and any admixture materials, immediately
upon delivery to the site, shall be stored in weatherproof sheds, or
upon platforms raised free of the ground and effectively protected by
tarpaulin covers from exposure to the weather until used. No cemonti-
tious or other material that has become caked and hardened from
absorption of moisture will be permitted in the work. Bagged cement
stored for more than 2 months shall be approved by the Contracting
Officer before using.
4,5 PREPARATION AND STORAGE OF LIME 'PUTTY:
Lime putty shall be made from hydrated lime, or pulverized
quick-lime mixed with water to form a stiff, plastic putty. Putty made
of hydrated l7.mo, must be stored for more than 24 hours before use' in
the mortar mix, and precautions taken to protect it from excessive
evaporation. Putty made from quicklime shall be paused through a No. 10
sieve and stored for 72 hours prior to use, Store in a manner to prevent
undue loss of moisture of heat during slaking period.
06 MORTAR. MIXING AND PROPORTIONING:
a, General: Use approved type batch mechanical mixer;,
except that when approved by Contracting Engineer, mortar may be mixc;d
by hand. Mixing time shall be not less than 5 minutes, approximately
2 minutes of which shall be for the mixing of dry materials. Hand-
mixing shall be done in a tight mortar-mixing box.
b, Pro ortioning: Mortar shall be proportioned by volume
within the following unit:
Mortar Hydrated Lime or Aggregate
Strength Portland Lime Putty (Damp and Loose)
psi Cement Minimum Maximum Minimum Maximum
1, 800 1 1/3 1/2 3-1/4
The cement content specified is the minimum. Where the fine aggregate
which is locally available or readily obtainable does not produce the
specified compressive strength but is in all other respects satis-
factory, the fine aggregate content shall be decreased to the extent
required to obtain that strength with related density, bonding value
and other properties.
c. Measurement: The method of measur4ng materials for
mortar shall be such that the specified proportion of the materials
can be controlled. and accurately maintained., The weights per cubic
foot of the materials shall be considered as follows:
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Material Vkight per Cubic Foot
(pound)
Portland cement .. ... . . . . . . . .
94
Hydrated lime. . . . . . . . . . . .
40
Quicklime putty
80
(minimum)
Hydrated lime putty
80
Fine aggregate (dry) . . . . . . .
80
Fine aggregate (damp) .
85
07
A, Concrete Masonry Work:
a. General: Concrete masonry units shall be adequately
dry when laid, and those which do not meet the moisture-cement limita-
tion hereinabove specified shall be set aside for further drying and
shall not be used until retested. Unprotected concrete masonry units
which have been rewetted shall be considered too wet unless shown by
test to be otherwise. Masonry shall not be erected when, in the opinion
of the Contracting Engineer, the sun, heat, wind or limitations of
facilities furnished by the Contractor prevent proper setting and
curing or mortar joints or obtaining proper bond in the mortar. No
conceete masonry units having a film of water on their surface shall
be laid in the walls. Concrete masonry units shall not be wetted
before laying. Masonry shall be laid plumb, true to line, with level
and accurately spaced courses and with each course breaking joints
with the course below. Bond shall be kept plumb throughout. Corners
and reveals shall be plumb and true. Chases, grooves of reglet blocks,
and raked-out joints shall be kept free from mortar or other debris.
Spaces around metal door frames and other built-in items shall be
solidly filled with mortar. Anchors, wall plugs, accessories and
other items required to be built in with masonry shall be built in
as the masonry work progresses. A properly paid out story rod shall be
used for all construction to insure accuracy of construction. No
units shall be cut without approval of the Contracting Officer. Where
shorter units are required, filler blocks as hereinafter specified shall
be used. Cells with vertical reinforcement shall be filled with
concrete grout. Reinforcement shall be lapped not less than 8 inches,
and the lap shall contain one cross wire of each piece of reinforcement.
Corner shapes and intersecting wall reinforcement hereinbefore described
shall be installed.
b. Concrete masonry unit walls and. partitions shall be
s2"eCted where shown on the dra ngs. Each cours? shall be solidly
bedded in mortar hereinbefore specified, with vertical joints slushed
full with mortar and breaking halfway over the units in the course
below. Mortar joints shall be approximately 3/8-inch wide. Mortar
joints in exterior walls, including starter joints, shall have full
mortar coverage on horizontal and vertical face shells, but mortar
shall not extend through the unit on the web edges. Mortar joints
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on the weather side of exterior walls shall be thoroughly connected
and pressed tight against the edge of the units and shall be cut
flush to receive the required covering and tooled flush when exposed.
Units terminating against soffits of beams or blab construction shall
be wedged tight with slate or clay-tile wedges, and the joint slushed
solid with mortar. Each course shall be bonded at corners and inter-
sections and shall be either bonded into the adjacent construction or
anchored thereto with galvanized metal anchors spaced not over 2 feet
on centers in each direction. Jamb units shall be of shapes and
sizes required to bond. with the well units and shall be built in.
where shown on the drawings or required. No cells shall be left
open in face surfaces. Tooling of the joints shall be delayed unitl
after the mortar has begun, to stiffen, and the tolling operation
shall not expose the joint reinforcement. Joint reinforcement that
has been exposed by tooling shall be covered with mortar. All cracks
and openings in the wall face shall be filled with mortar to the depty
of the face shells, Masonry-unit walls or partitions supporting
plumbing or heating fixtures or other items, voids at doors and window
jambs, and other spaces requiring grout fill shall be filled solid with
the specified mortar mixed to pouring consistency.
c, Concrete masonry units: Bed each course with
vertical joints breaking halfway over the course below. Make joints
approximately 3/8-inch wide, with full mortar coverage on vertical
and horizontal interior and exterior face shells. Do not extend mortar
bed through the unit on the web edges. Bond each course at corners
and intersections,
d. Cutting and patching: Cutting and patching of
masonry required to accommodate the work of others shall be performed
by masonry mechanics.
e. Unfinished work: Step back unfinished work for
joining with new work. Before new work is started remove loose mortar
and throughly wet the exposed joint, not less than 12 hours before
resuming,
f. Protection: Properly protect surfaces of masonry
not being worked-on at all t s during construction operations. At
such time as rain is imminent and the work is discontinued, cover tops
of exposed masonry walls and similar surfaces with a strong waterproof
membrance well secured in place.
g. Pointing and cleaning: At completion of work,
point all holes in joints of exposed masonry and. then clean the surfaces,
a. General: Shall be wetted and allowed to drain and
then laid in cement mortar n British bond. All brick shall be laid
in full mortar beds with vertical joints slushed full.
b. All brick work shall be laid so as to point to
the exterior of the structures in order to provide for a clean and
uniform exterior surface.
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01 SCOPE :
The work covered by this section of the specifications consists
in furnishing all plant, labor, equipment, appliances and materials and
in performing all operation in connection with the installation of carpentry,
complete, in strict accordance with this section of the specifications
and the applicable drawings, and subject to the terns and conditions of
the contract.
a. Gen eral: Quality requirements for materials listed heroin
are based on U.S. Federal Specifications. However, the use of products
25X1A of reputable manufacturers is intended where equivalent to the
materials specified, subject to the approval of the Contracting officer..
b. Lumber shall conforln to the requirements of Federal
Specifications MM-L-736 and MM-L-751. Any of the-Lumber of the 25X1A
25X1A species listed below, or lumber of species equivalent of the
species specified, may be substituted if possessing characteristics as
set forth in the applicable grading rules listed in Federal Specifications
MM-L-736 and MK-L-851., and if approved by the Contracting Officer. All
lumber must be termite treatedi
(1) Bucks, frames: Yard Lumber of the grades indicated:
25X1A _. . . . . . . . . . 1st Grade
(2) Interior trim, shelving and miscellaneous finish:
Factory clean Lumber of Select Yard Lumber of the grades indicated:
25X1A
(3)
25X1A
Nailers, blocking:
(4) Door (plywood and plywood finish) : - 1st Grade,
use same species throughout.
C. P1 rwoo~d shall conform to Federal Sp,e,ci_fic-tion NN-P-53O
.with face veneers as hereinafter specified. 3/8 or-1/2-inch plywood
shall have not less than 5 piles, 3/4-inch plywood not less than 7 plies
and 1 inch plywood not less than 9 piles.
. . . . . . lst Qrade
. . . . . . . lst Grade
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d. Bolts and nuts shall conform to the requirements of
Federal Specification FF-B-571, unless otherwise approved by the
Contracting Officer.
e.. Calking compound shall conform to the requirements of
Federal Specification TT-C-598, Grade I, for gun application wherever
practicable,
f. Clamps, expansion bolts, expansion screws, washers
and anchors shall be of steel and iron and of standard type and
manufacture.
g. Glue shall be case in type and shall conform to the
requirements of Federal Specification MM-A-125.
h. Lag screws shall conform to the requirements of Federal
Specification FF-B-56l, unless otherwise approved by the Contracting
Officer.
i. Nails shall conform to the requirements of Federal
Specification F -N-105,, or may be t'-1o drive-screw or spiral type of
standard manufacture.
k. Steel plates and shape: Items involving steel plates
and shapes shall be made of steel conforming to the requirements of
Federal Specification QQ-S-74l, of the type, grade and class normally
used in commercial practice.
1. Steel sheets sh_1-'1_ conform to Federal Specification
QQ-#-636, either hot or cold-rolled, and of the class, condition and.
finish best suited for the purpose.
m. White lead paste shall conform to the requirements of
Federal Specification FF-S-111, unless othearwise approved by the
Contracting Officer.
n. Acoustical Units shall be of incombustible composition
manufactured from. compressed cane fiber. Products of a reputable
25X1A - manufacturer may be used, subject to the approval of the Contracting
Officer. Tile shall be of uniform size and thickness, 12" x 1211 and
shall be perforated with beveled edges. Exposed surfaces shall be factory
finished with white wash.
o. Nails for acoustical units shall be galvanized or zinc
coated after anmufacture. Nails shat e of sufficient length to securely
hold the units in place when countersunk into the perforations as detailed
on the drawings.
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 Approved For Rell a 1999/09/20 : CIA-RDP78-05613A00030007QO02-6
p. Plastic coated insect metal screens shall be 18 x 18
mesh. Metal screen' cloth shall conform to Federal Specification RR-S-l4jl,
type II, III to VII, regular wire size, green color.
a. Grading: Grading of lumber of the various species
shall conform to the requirements of Federal Specifications NM-L-746
and MM L--751, or conform to the grading rules cited in these speci-
fications.. Specific requirements for each lumber grade shall be on
the basis of density,, strength, ring count, number and extensiveness
of checks., shakes; splits, knots and gun pockets, amount of wane,
cross-granularity, decay, stains and other surface imperfections.
The general requirements for lumber grades are here outlined for
guidance. only, and are not to be construed as being determinant.
(1) Structural grade: Lumber of structural sizes
and shape, graded with respect to its strength.
(2) Yard lumber: Lumber classified into sizes, shapes
and qualities required for ordinary construction and general purpose
use,
finishing qualities.
(a) Select: Lumber of good appearance and
1st Grade: Suitore
than 12 percent by voiu;Le of thinner. All -taint E",terials shall be
delivered to the job in original , unbroken containers, with labels
and tags intact, and. confora to international stendards for anti-
sulphide paints, and acce~-Aee by the Contracting Officer.
b. Exterior Oil Paint: Exterior oil -hint shall conform as stated in
Paragraph a )
.
c.. Interior Seai-Gloss Enamel:. Interior sea-gloss enaa:el paint shall
wall paint and conform as stated in para~ rah (a)
d. Primer Painto
(1) Exterior .1'riaor Paint: Exterior priw.aer shall confora as state a_
in paragraph (a).
(2) Interior Frii.aer--Sealer Paint: Interior-primer-sealer paint
sba.ll''conforri as stated in paragraph (c ).
~. Color Pigments. Color pigh~.eents shall be pure, non-fading and finely
ground.
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f. i',Ascellanecus Paint i;.:aterials: The following paint materials shall
the beat local products obtainables
(1) putty
(2) Varnish
(3) Lrior, Liquid
(4 Linseed Gil
(5) Thinner
6 Turpentine
7) Creosete
g. Exterior Type Paint; Paint for exterior Petal shall conforn to the
require- ents of Federal Specification TT-P-869 type IV9 paint;
lied-Lead-3ase linseed Ci19 ,:iea(y Laised.
04. P e P1ilL.TIC'P CF SU U'1.C S 1511 1.'PL~iCi iO:N OF Pr:.INT:
a. Generale
(1) Hardware, hardware ~accessorie s 9 plates 9 lighting fixtures and
similar itens in ;-)lace rior to painting 9 shall be renoved during
painting operations and repositioned upon coa:pletion of each space 9
or shall be otherwise protected.
(2) Zxce;)t as otherwise specified, all surfaces to be painted shall
be clean, seooth9 dry, and free from, duct and grit. ' All work shall
be done in a work.:anlike Launer9 leaving the finished surfaces free
from drops, rid es, Wave-119 la; s 9 and brush ;;;arks. Paint shall be
applied under cry and. dust--free conditions.
(3) Sufficient time shall be alicaecd between coats to ensure proper
drying. Paints shall be thoroughly stirred and kept at a uniform
consistency during application and shall not be thinned in excess of
the printed directions of the ;u:.anufacturer. All s;~eci~~l driections or
Specifications of the manufacturer as to surface preparation, al.plicati
of p6 innt 9 and equip.went' thereo; 9 shall be observed ane, cob; plied with
unless otherwise spe cif ied. horein.
(4) Whore painting on any type of surface has been coL:-a onced. on any
portion of the work, the conn,dlete painting o,'Ier,.tion, including
and fin~aishing coats, on that .;-Portion of t e or , shall be conpieted
as soon as practicable, wit out prolonged delays. Unless otherwise
specified, sufficient tine shall elapse between successive coats to
pera>it thou to dry for recoating; and this uuini:Pun drying period shall
be modified as necessary to suit adverse weather conditions.
(5) At the time of a ;,.lication of each successive coat 9 undercoats
shall be freed of dust, grease or any foreign :iEAter, which LL ight
adversely af:ect intercoat adhesion, by ; eans of air blast, solvent
wiping or other approved moans. Paint any be applied by brush.
(6) Floors and other adjacent areas and installations shall be satis-
factorily protected by drop cloths or other ,recautionary measures.
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b. Woodworks
1`111 nillowrk and all other woodwork, where required, shall be sana:-
papered before application of the n)riw::er. WAll, dry, seasoned knots
shall be thoroughly cleaned and scrapped, and shall be given a thin
coat of orange shaallawc varnish before the pricing coat is applied.
Large, open, unseasoned knots and all beads or streaks of pitch
shall be heated by a blowtorch and then scraped off, or if the
pitch is still soft, it shall be rea.ovea with LLainergl spirits of
denatured alcohol. k-Meaultin voids, if any, shall be filled with
putty. Nails shall be set. Painting shall proceed only when, in
the .opinion of the Contracting Officer, the wood is satisfactorily dry.
(1) rianings Jill ;raillayvrk to be )aintec'd :hall be ,rind on all sides
before installations, with particular attention being given to the
sealing of cross-grained surfaces. 'oodwork other than ail1works
shall be primed on exposed surfaces only.
(2) Puttyingaand Glazing: fter the prir.ing coat has been applied,
nail holes, cracks, and other depressions shell be filled flush with
putty colored to match the finish coat, and sandpapered s.aooth.
Putty shall be dry before subsequent painting.
O. lu:dTEaLIO ~ 2 INTING:
a. Woodwork; Eiterior woodwork shall be painted one coat of exterior
primer paint and two finish coats of exterior oil :hint. Exterior
woodwork shall include all millwork, fray es, doors, sash and si ail-->r
work. Top and bottou edges of doors and screens, after fitting, shall
be given two coats of varnish.
b. Metal Work:
Surfaces to be p3ainteE shall be cleaned thoroughly of scule, dirt,
and rust by the sue of steel sc