TPO Details:D3.7.6-4 Curbs & Sleepers (Mechanical Opening)

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TPO Details:D3.7.6-4 Curbs & Sleepers (Mechanical Opening)

RoofStar Guarantee Standards are blue-linked
TPO/PVC Details


1) Gypsum Deck Overlay
May be required depending on insulation thickness or when required as a thermal barrier by design authority.
(2) Vapour Retarder
If required by design authority.
(3) Insulation
Mechanically attached or loose laid for ballasted roof assemblies. Installed according to RoofStar Guarantee Standards. See available insulation products in the Accepted Materials section of this Manual.
(4) Single-ply Membrane
Installed according to manufacturer’s instructions and RoofStar Guarantee Standards.
(5) Membrane Flashing
Adhered to curb according to manufacturer's printed specifications using proprietary adhesive. Must be carried to outside of parapet or minimum 200 mm (8") above finished roof surface. Thermoplastic membrane may be welded or chemically bonded.
(6) Metal Base Flashing
Mechanically fasten, standing seam at corners. Full width base flashing optional on flexible membranes. Partial skirt flashing minimum 75 mm (3") required on mechanical curbs that require flashing under metal flange.


(A) Acceptable Deck
(B) Vapour Retarder
(C) Mechanical Curb
Minimum 200 mm (8") and maximum 300 mm (12") above finished roof surface.
(D) Rigid Insulation

NOTE: Refer to RoofStar Guarantee Standards for additional requirements.

RoofStar Guarantee Standards for TPO/PVC Roof Assemblies

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