SBS Basic Curb

(1) Gypsum Board: Required when insulation is too thin to span flutes of steel decking (See RGC Guarantee Standard A2.5) or when required as thermal barrier by design authority.
(2) Vapor Retarder: If required by design authority.
(3) Insulation: Mechanically fastened. (See Section 2.2 for accepted materials). (See Section 2.1.1 RGC Guarantee Standard A4.4).
(4) Overlay Board: Asphalt adhered or mechanically fastened. Two layers required over heat-sensitive insulation. (See RGC Guarantee Standard C4.1)
(5) Base Sheet: Adhered to overlay board using asphalt, cold adhesive, self-adhered, mechanical attachment or torch applied according to manufacturer’s specification and to RGC Guarantee Standards. Torching directly to wood surfaces is not permitted.
(6) Base Sheet Flashing: Adhered according to manufacturer’s specifications, using cold adhesive, self-adhered, or torch applied to cover boards, or mechanically attached membrane. Torching directly to wood surfaces is not permitted. (See RGC Guarantee Standards Section 2.1.1, A5.6, and Section 2.1.3, C8.5).
(7) Cap Sheet: Applied according to manufacturer’s printed instructions and to RGC Guarantee Standards.
(8) Cap Sheet Flashing: Applied according to manufacturer’s printed instructions and to RGC Guarantee Standards to top of curb.
(9) Metal Flashing: As required by RGC standards. (See RGC Guarantee Standard A6.9 and A6.10)

(A) Acceptable Deck
(B) Vapor Retarder
(C) Wood Blocking: Minimum 200 mm (8") in height. (See asphalt adhered or mechanically fastened. Two layers required over heat-sensitive insulation. (See RGC Guarantee Standard A5.6.2) Cant is optional.

NOTE: Refer to RGC Guarantee Standards for additional requirements.