Asphalt Shingles - Cylindrical Penetration (Flashing, Storm Collar)

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Asphalt Shingles - Cylindrical Penetration (Flashing, Storm Collar)

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Division D - Construction Details

ASh 11.3.1 Penetration flashing with storm collar

Notice to Reader
Images used in a Construction Detail are representative and not prescriptive. Nor are they necessarily drawn to scale. Rather, they are provided to visually convey the requirements of the Standard they represent. Unless otherwise required by the Standard, dimensions, the selection of materials and their application remains the responsibility of the Design Authority.

The full text of the referenced requirements in the Standard may be read by using the blue hyperlinks
Asphalt Shingle Details

ASh 11.3.1.jpg


(1) Underlayment
Self-adhering or mechanically fastened, depending upon the designed slope (see 8.1.2 Design). Install “shingle-style” and overlap roll ends at least 150 mm (6”); side laps must be at least 75 mm (3”).
(2) Penetration flashing
Conforming to material standards in 11.2 Materials. Drawing shows cut-away, for illustrative purposes only.
(3) Horseshoe patch
Self-adhered membrane cut to fit penetration flashing flange and extend beyond flange edges as shown in drawing and required in 11.3.1 General.
(4) Underlayment patch
Overlaps the horseshoe patch and fits beneath the upper course of underlayment material.
(5) Drainage path (top of penetration flashing)
Minimum 12 mm (1/2”).
(6) Drainage path (side of penetration flashing)
Minimum 19 mm (3/4’).
(7) Exposed fasteners
Cladding fasteners with gasketed washers. See 11.3.1 General and 13.2.3 Fasteners.
(8) Storm collar
Required for pipe-type flashings (see 11.3.3 Penetrations and Vents). Caulked with an untooled bead of an acceptable sealant.


(A) Penetration
(B-vent shown)

NOTE: See the Standard for additional requirements.

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