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7510 Guide Specifications:
Asphalt, Gravel Surfaced, Built-Up Roof System
F. Vapor Retarder Application – Wood Deck
1. [Install one ply of dry sheathing paper; lap edges 2 inches (51 mm).]
2. Install one ply JM [GlasBase] [DynaBase]; lap edges 2 inches (51 mm). Nail laps 9 inches (229 mm) o.c. Nail the field area at 18
inches (457 mm) o.c. staggered.
3. Mop surface with hot asphalt and embed [two plies] [one ply] of roofing felt, meeting ASTM D 2178, Type [IV] [VI]; lap plies [19
inches (483 mm)], [2 inches (51mm)]. Apply asphalt at 23 lbs./square (1.12 kg/m2) nominal.
4. Extend vapor retarder under cant strips and blocking.
G. Vapor Retarder Application – Concrete Deck
1. Apply JM Concrete Primer at one gal/square (0.41 liters/m2) and allow to dry.
2. Mop surface with hot asphalt and embed two plies of roofing felt, meeting ASTM D 2178, Type [IV] [VI]; lap plies 19 inches (483
mm). Apply asphalt at 23 lbs./square (1.12 kg/m2) nominal.
3. Extend vapor retarder under cant strips and blocking.
H. Vapor Retarder Application – Metal Deck
1. Apply first layer of insulation with approved mechanical fasteners at rate and pattern to meet FM requirements.
2. Mop surface of insulation with hot asphalt and embed two plies of roofing felt, meeting ASTM D 2178, Type [IV] [VI]; lap plies 19
inches (483 mm). Apply asphalt at 23 lbs./square (1.12 kg/m2) nominal.
3. Extend vapor retarder under cant strips and blocking.
I. Insulation Application
1. [Ensure vapor retarder is clean and dry.]
2. Mechanically fasten [first layer of] insulation to deck. Mechanically fasten insulation boards per FM [1-60] [1-90]. [Embed a
second layer of insulation in a mopping of hot asphalt in accordance with insulation manufacturer’s instructions.] [Install second
layer of insulation with joints staggered from first layer.]
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3. Embed [one layer] [two layers] of insulation into mopping of hot asphalt in accordance with insulation manufacturer’s
instructions. [Install second layer of insulation in a mopping of hot asphalt, staggering joints from first layer.]
4. Minimum Total Insulation Thickness: [[_____] inch ([_____] mm).] [As required to achieve an insulation ‘R’ value of [_____]].
5. Install insulation boards with edges in moderate contact, without forcing. Cut insulation to fit neatly to perimeter blocking and
around penetrations through roof.
6. [Install tapered insulation boards] [Cut boards to slope] for a distance of [18] [24] [_____] inches ([457] [610] [_____] mm) back
from roof drains for positive drainage.
7. Apply no more insulation than can be sealed with membrane in same day.
J. Membrane Application
[NOTE: Paragraph 1 is for a nailable spec. only.]
1. [Install one ply [Ventsulation Felt] [GlasBase]. Lap sides 2 inches (51 mm); lap ends 6 inches (152 mm). Nail the side laps 9"
(229 mm) o.c. Down the longitudinal center of each felt, place two rows of nails spaced approximately 11" (279 mm) apart, with the
nails staggered on approximately 18" (457 mm) centers. Use nails or fasteners appropriate to the type of deck with 1" (25 mm)
minimum diameter caps.]
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