Document Qg2XwN677zmVwXJ3E38DXJbm5
SPECIFICATION FOR
AREA "C" MAINTENANCE OFFICE FACILITY
AT PPG INDUSTRIES, INC. LAKE CHARLES, LOUISIANA
P-474
Revised January 17, 1975 Revis d March 3, 1975
---JL0356iT7
10-1
SECTION 10
BUILT-UP ROOF, ROOF INSULATION, ROOF DECK
10.01 SCOPE
AND ROOF SHEETMETAL
The work under this section includes all labor, material and equipment required to furnish and install roof insulation, built-up roofing and roof flashing.
10.02 GENERAL
The roofing, roof insulation and roof flashings shall be Johns Manville, or equal as specified below, or approved equal, applied in strict accordance with the manufacturer's specifications and the work shall be done by a Contractor approved by the manufacrurer,
10.03 ROOF DECK
See Section 12.
10.04 BUILT-UP ROOFING
10.04.1
Roof to be constructed as a twenty (20) year conventional
built-up roof. Use a minimum of a 43^ base felt and two
(2) plies of 33^ felt. Roofing to be hot mopped and topped
with pea gravel.
_____
10.04.2
Application is to be made by experienced workmen only and in a manner satisfactory to the Owner.
10.04.3
The laying of the felt shall commence at the roof edges. Apply the roofing so that the direction of the flow of water is over and not against the laps. Roll or broom all plies Into hot pitch or asphalt and lay without wrinkles, buckles, or kinks so that the finished roof is free of pockets or blisters. All moppings must completely cover the area to which they are applied so that no part of the surface to be covered shows through the moppings. Felts shall be broomed in while the asphalt or pitch is still hot. Overlap ends of all connecting plies of felt not less than six inches.
| BB 0003567 |
10-2
10,05 PREPARATION OF ROOF DECIC SURFACES
laos.i Roof deck must "be thoroughly dry "before application of roofing.
10.05.2 All roof surfaces shall "be reasonably smooth, free of loose material, and broomed clean.
10.05.3
The roof applicator shall inspect the roof surfaces for appar ent defects that would injure the roofing felts, and shall notify the general contractor and the PPG representative of any defects. The roof applicator shall not proceed until all the defects have been corrected and he has been notified by the Owner's representative to proceed.
10.06 24ATERIALS
10.06.1 Materials to be used shall be of the type and number specified. When material is specified by name or number, no substitu tions will be permitted without written approval of the Owner.
10.06.2
All material to be used in built-up roofs shall be kept dry and free of dirt and other 'njurious matter before and during application. All roofing m cerials shall arrive on the job in the manufacturer's containers clearly labeled as to the contents.
10.06.3 Insulating material shall be used only when and as noted on the drawings, specified herein, or in the Job specifications.
10.O6.4 The roofing felts shall be rag felt, asbestos felt, or fiberglas felt.
Felts shall be in accordance with ASTM-D226 Asphalt Saturated Roofing Felt, ASTM-D227 Coal Tar Saturated Roofing Felt, ASTMD250 and D655 Asphalt Saturated Asbestos Felt, Asphalt Saturated Porous Glass Mat as manufactured by Ouens-Corning Fiberglas Felt Corporation, the Flinkote Company or Johns-Manville.
10.06.5 Asphalt shall be in accordance '>ith ASU1-D312. Asphalt shall
not be heated to exceed 450F, or to exceed the manufacturer's rec oomendations.
10.06.6 Coal tar pitch shall be in accordance with ASTM-D450.
10.06.7 Surfacing
Gravel shall be to 5 /' in size.
1 BB 0003568 J
10-3
10.07 flashing
10.07.1 Flashings shall he installed according to good roofing practices to produce a water-tight Joint and according to the requirements for a 20-year bonded roof.
10.07.2 Any type of flashing must extend up vails or vertical surfaces at least eight inches above the grade line of the roof deck,
10.07.3 Flashing details for roof, vents, drains, sleeves, etc., shall be as shown on the drawings.
10..07.4 Wood cants or nailing strips shall be used on concrete decks only when noted on the drawings or in the Job specifications.
10.08 GRAVEL GUARDS
10 .08.1 Metal gravel guards shall be installed as shown on the drawings.
10 08.2
Gravel guard shall be fabricated from 24 gauge stainless steel sheet metal. Surface flange shall be at least four inches wide and over-all stretch-out shall be nine Inches. Edge of gravel guard on fascia shall be crimped at an angle of approximately 45.
10. 08.3
Gravel guards shall be bedded in plastic cement and over all felt plies, nailed and double felt stripped. Felt strips shall be at least nine inches and 18 inches :**-4iidth respectively, thoroughly mopped together and 00 the guard. Under no circumstances are gravel guards to be installed under or between plies of felt.
10 .08.4 All gravel guard Joints shall be lapped at least five inches and shall he bedded in plastic cement.
10 .08.5
Gravel guards shall be securely fastened with galvanized flat-head nails, or approved equal, spaced on nine-inch centers. In fastening to concrete, care shall be taken to avoid spalling or other damage to concrete. If damage does occur. It shall be repaired to the satisfaction of the Owner.
10 .09 GUTTERS - EAVB
The building shall be furnished with 5" x 4" box gutters of 20 gauge . stainless steel and with necessary supporting stainless brackets on 4'-0" spacing. Gutters shall be welded at all Joints.
10 .10 DOWNSPOUTS
I BB 00 03569 |
3" x 4" 20 gauge stainless steel den spouts shall be furnished as indicated on the drawings. These downspouts shall extend to the same grade as the bottom of the columns and have a 45 degree elbow to throw
water away from the foundation of the building.
*75
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