Asphalt Shingles - Application (Low Slopes)

Division D - Construction Details

ASh 9.1.2 Shingle Application (Low Slopes)

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Asphalt Shingle Details

Applicable to slopes 1:6 (2" in 12") and greater.

(1) Underlayment & Eave Protection: One ply of self-adhered modified bituminous underlayment material. Lap 75 mm (3") minimum on sides and 150 mm (6") minimum on ends.
(2) Edge Metal Flashing: Required for all eave and rake edges.
(3) Starter Course: Consists of same type shingles used for roof, applied tabs facing up the slope.
(4) Strip or Standard Shingles: Applied as recommended by manufacturer. Laminated shingles are not acceptable for this application unless expressly permitted by the manufacturer.
(5) Compatible Mastic: Heavy bead of compatible asphaltic mastic at rakes (gables) and valleys.
(6) Protrusions: Curbs and skylights must be flashed with underlayment so as to shed water, with minimum 125mm (5") up vertical surfaces and 150 mm (6") lapping onto field surfaces (See 11.3.4 Curbs). Penetration flashings must be installed following the requirements in 11.3.3 Penetrations and Vents. For fire-rated stacks or hot pipe protrusions, strip in secondary metal deck flashing before installing rated stack / pipe flashing.
(7) Nailing: See the requirements in Section 3.3 Application.

NOTE: See the Standard for additional requirements.

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