WP Details:F1.7.8 (Walls - Window Curb & Flashings)

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WP Details:F1.7.8 (Walls - Window Curb & Flashings)

RoofStar Guarantee Standards are blue-linked
Waterproofing Details for Plazas, Promenades and Terraces



(1) Primary Waterproofing Membrane: Fully adhered to acceptable substrates and installed as per RoofStar Guarantee Standards for Waterproofing Plazas, Promenades & Terraces as well as Membrane Manufacturer's application specifications.

(2) Membrane Flashing: Carried up walls a minimum 200 mm (8") above membrane surface (Deck) and a minimum of 100mm (4") above top surface of permeable waterproofing wearing surfaces and overburdens.Membrane flashing must extend to inside edge of window mullion curb (fenestration assembly). Membrane gussets must be installed at all corners and transitions.

(3) Insulation: Extruded, Expanded Polystyrene, Type 4, CAN/ULC-S701-97, compressive strength of 240 kpa (35 psi).

(4) Metal Wall Flashing: Required on all waterproofing assemblies at up stand (walls etc.) interfaces.

(5) Drainage Board & Filter Fabric: Proprietary drainage board approved by membrane manufacturer, compatible with waterproofing membrane system, and compliant with Section 10, Drainage.


(A) Acceptable Deck: Concrete slab shown.(B) Supporting Curb: Height varies depending on the insulation thickness and type of waterproofing assembly.

(C) Metal Water Stop Flashing: Mechanically attached to the top of the window curb. Cut flashing to fit the opening and pan fold, weld, or solder seams at all corners and mitres.

(D) Metal Water Stop Flashing Seam: Overlap metal water stop joints a minimum of 150mm (6") and seal joints with two rows of structural sealant.

(E) Building Envelope Membrane Flashing: Must be compatible with and overlap the roof membrane flashing. Membrane gussets must be installed at all corners and transitions.

(F) Metal Cap Flashing: Adhere metal cap flashing to membrane flashing with a membrane compatible structural sealant. Mechanical attachment of metal flashing through the membrane flashing is not acceptable.

(G) Fenestration Assembly: CAUTION - Securement fasteners MUST NOT penetrate the metal or membrane flashing.

(H) Fenestration Assembly Securement Bar - ONLY fasten securement bar through upper vertical leg of the window mullion (frame).

(I) Poured Concrete Wearing Course: Concrete slab designed to support predicted live loads.

NOTE: Refer to RoofStar Guarantee Standards for additional requirements.

RoofStar Guarantee Standards for Waterproofing Plazas, Promenades & Terraces

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