Draft CD 12

Notice to Reader
Images used in a Construction Detail are representative and not intended in their representation of an assembly to be prescriptive. Nor are they necessarily drawn to scale. Rather, they are provided to visually convey the Standards, Guiding Principles and Recommendations of the RoofStar Guarantee Standards for a Waterproofing or Water-shedding System. Actual design with respect to dimensions, the selection of materials and their application remains the responsibility of the Design Authority. The full text of applicable RoofStar Guarantee Standards may be read by using the blue hyperlinks

ASM Details

Click below for a printable version of this page.

(1) Underlayment: The type of underlay required is determined by roof slope.
(2) Insulation: Offset and stagger layers 300 mm (12").
(3) Separation layer: Vapour-permeable layer over insulation, required on all insulated Architectural Sheet Metal Roof Systems. The material must be located between the insulation and metal panels (see 8.1.2 Design).
(4) Ventilation layer: Recommended over asphaltic underlays and / or as required in this Standard (see 8.1.2 Design).

(1) Architectural Metal Roof Panel (lower): Lower, installed prior to the pipe flashing, cut hole large enough to allow for movement. Extend 400 mm (16") upslope beyond the pipe.
(2) Settlement Cap: Material must match flashing material.
(3) Drag-load Fasteners: Compatible non-corrosive fasteners.
(4) Sealant Tape: Two rows of sealant tape or acceptable caulking.
(5) Caulking: Bead of caulking tooled into transition between metal roof panel and flashing.
(6) Protrusion Flashing: Flange set in two continuous beads of accepted caulking.
(7) Metal Clip on Bearing Plate.
(8) Separation Layer (Drainage Mat): Required for slopes less than 1:3; recommended over asphaltic underlays and / or as required by metal roof panel manufacturer.
(9) Underlayment: The type of underlay required is determined by roof slope.
(10) Spaced Cleat: Cleats, set in accepted caulking, spaced 50 mm (2") and fastened with compatible non-corrosive flat head screws.
(11) Architectural Metal Roof Panel (upper): Upper, installed after installation of pipe flashing. Cut hole for pipe penetration and turn panel end under to accommodate cleats.

(A) Acceptable deck
(B) Wall control layers: must be positively lapped with roof materials and flashings, to maintain continuity across systems.
(C) Wall cladding

NOTE: Refer to RoofStar Guarantee Standards for additional requirements.