SBS Flange-style Drains (clamping)

Jump to: navigation, search

SBS Flange-style Drains (clamping)

RoofStar Guarantee Standards are blue-linked
SBS Details


Click below for a printable version of this page.
Print Sheet


(1) Supporting Deck Overlay
Required when insulation is too thin to span flutes of steel decking or when required as thermal barrier by design authority.
(2) Air or Vapour Control Layers
If required by design authority.
(3) Insulation
Mechanically fastened. See available insulation products in the Accepted Materials section of this Manual.
(4) Insulation Overlay
Asphalt adhered or mechanically fastened. Two layers required over heat-sensitive insulation.
(5) Field Base Membrane
Adhered to overlay board using asphalt, cold adhesive, self-adhered, mechanical attachment or torch applied according to manufacturer's specification and to RoofStar Guarantee Standards. Torching directly to wood surfaces is not permitted.
(6) Mastic
Compatible mastic accepted by the membrane manufacturer.
(7) Base Membrane Flashing
Adhered according to manufacturer's specifications and to RoofStar Guarantee Standards.
(8) Field Cap Membrane
Applied according to manufacturer's printed instructions and to RoofStar Guarantee Standards.


(A) Acceptable Supporting Deck Structure
(B) Clamping Copper Drain
Primed and mechanically fastened. Installed in bed of compatible mastic.

NOTE: Refer to RoofStar Guarantee Standards for additional requirements.

  • Leader size is determined by design authority using the calculation found in the BC Building Code at Appendix P.7.4.10 and Section (Section for gutters) in conjunction with the 15 minute rainfall value from the National Building Code, Appendix C.

Back to RoofStar Guarantee Standards for SBS Modified Bitumen Roof Assemblies

Back to SBS Modified Bitumen Construction Details

Back to Construction Details