ASM Curb (Split Panel Flashing)

Jump to: navigation, search

ASM Curb (Split Panel Flashing)

Division D - Construction Details

ASM | Curb (Split Panel Flashing) ( Article

Notice to Reader
Images used in a Construction Detail are representative and not prescriptive, and are not necessarily drawn to scale. They are intended to support the related Standard (Ref. Division A, Article

The reader may link to the related Article in the detail title, or link to the Standard as it relates to a specific element in the detail. All hyperlinks are displayed blue text.

ASM Details

ASM 11.2.1 Curb, Split Panel.jpg

Click below for a printable version of this page (N/A)
Print Sheet


(1) Underlayment
The type of underlay required is determined by roof slope.
(2) Insulation
Offset and stagger layers 300 mm (12").
(3) Vapour-permeable separation membrane
Installed over insulation and required on all insulated Architectural Sheet Metal Roof Systems. The material must be located between the insulation and metal panels/ventilation material (see 8.1.2 Design).
(4) Ventilation beneath panels
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.
(5) Bearing plate
Only thermally non-conductive clips or bars passing through the insulation assembly, or mechanically fastened bearing plates, may be used to secure and support insulation panels, or provide support for panel clips.
(6) Architectural metal panel clip
(7) 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.
(8) Spaced Cleat
Cleats, set in accepted caulking, spaced 50 mm (2") and fastened with compatible non-corrosive flat head screws.
(9) Sealant
(10) Split panel
(11) Backpan Flashing
Required for curbs up to 900 mm (36") wide.
(12) Metal Curb Flashing
(13) Metal Counter Flashing
(14) Architectural metal roof panel (upper)
Installed after penetration flashing. Cut hole for pipe penetration and turn lower panel end under to hook onto cleat.


(A) Acceptable deck

NOTE: See the Standard for additional requirements.

Back to ASM Roof System Details


© RCABC 2022
No reproduction of this material, in whole or in part, is lawful without the expressed permission of the RCABC.