ASM 10.3.2 Unhooked Valley Flashing

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ASM 10.3.2 Unhooked Valley Flashing

Division D - Construction Details

<bigASM 10.3.2 Unhooked Valley Flashing

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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.

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SBS Details

ASM 10.3.2 Unhooked Valley Flashing.jpg

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Print Sheet


(1) Valley protection membrane
Accepted self-adhered modified bituminous eave protection membrane.
(2) Valley Metal Panel
Preformed with centre rib.
(3) Metal panel clip
Installed to metal roof panel manufacturer's printed instructions.
(4) Valley panel overlap
Overlaps minimum 200 mm (8") sealed with two rows of acceptable sealant or butyl tape, and secured with drag load fasteners.
(5) Membrane flashing
Accepted self-adhered modified bituminous eave protection membrane.
(6) Underlayment
The type of underlay required is determined by roof slope.
(7) Ventilation layer
A ventilation space is required on slopes less than 1:3; entangled mesh (shown) may be used as void fill. The ventilation space facilitates drying as condensation forms on the underside of the metal panels.
(8) Sealant or pre-formed closures
Required at the bottom ends of panels.
(9) Architectural metal roof panel


(A) Acceptable Deck

NOTE: See the Standard for additional requirements.

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