SBS Conventionally Insulated System (typical)

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1 WORK INCLUDED

(1) Gypsum Deck Overlay

Required when insulation is too thin to span flutes of steel decking or when required as a thermal barrier by design authority.

(2) Vapour Retarder

If required by design authority.

(3) Insulation

Mechanically fastened.

(4) Insulation Overlay Board

Asphalt adhered or mechanically fastened. Two layers required over heat-sensitive insulation.

(5) Base Sheet

Adhered to overlay board using asphalt, cold adhesive, self-adhered, mechanical attachment or torch applied according to manufacturer’s specification. Torching directly to wood surfaces is not permitted.

(6) Base Sheet Flashing

Adhered according to manufacturer’s specifications using cold adhesive, hot asphalt self-adhered or torch applied to cover boards, or mechanically attached membrane. Torching directly to wood surfaces is not permitted. Must be carried over to outside of parapet or minimum 200 mm (8") above finished roof surface.

(7) Cap Sheet

Applied according to manufacturer’s printed instructions, all options.

(8) Cap Sheet Flashing

Applied according to manufacturer’s printed instructions to top of parapet or minimum 200 mm (8") above finished roof surface. All options.

(9) Metal Flashing

As required by RGC Guarantee Standards.

(10) Primer

Prime wood substrate to receive self-adhesive base membrane stripping.

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2 RELATED WORK BY OTHERS

(A) Acceptable Steel Deck

(B) Plywood Backing

Required on rough surfaces or where adhesive is asphalt. Must be primed.

(C) Sloped Wood Blocking

Sloped to roof where parapet is over 100 mm (4") in width. Must be primed.

NOTE: Refer to RGC Guarantee Standards for additional requirements.

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