Difference between revisions of "SBS 11.3.2.2-1 Cast Iron Drains"

Revision as of 18:08, 7 September 2021

Division D - Construction Details

SBS 11.3.2.2-1 Cast Iron Drains

Notice to Reader
Images used in a Construction Detail are representative and not prescriptive. Nor are they necessarily drawn to scale. Rather, they are provided to visually convey the requirements of the Standard they represent. Unless otherwise required by the Standard, dimensions, the selection of materials and their application remains the responsibility of the Design Authority. The full text of the referenced requirements in the Standard may be read by using the blue hyperlinks

SBS Details

(1) Supporting Deck Overlay: If required 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) Primary Membrane and Membrane Protection
(6) Mastic: As approved by manufacturer.
(7) Base Membrane Flashing: As approved by membrane manufacturer (See (C) below).

(A) Acceptable Supporting Deck Structure
(B) Roof Drain Assembly
(C) Lead Flashing: Minimum 15 kg / m² (3 lb / ft²) weight lead sheet; flange extending minimum 25 mm (1") into bowl to 150 mm (6") beyond perimeter of drain; embed in mastic (6) and prime top surface where required by manufacturer or minimum 1 m x 1 m (39" x 39") 3 mm thick modified bituminous base sheet; to be supplied by trade supplying roof drain. For optional installation methods that use a membrane flashing in place of lead, see the Application requirements under 11.3.2.2 Cast-iron Roof Drains.

Leader size is determined by using the calculation found in the BC Building Code at Appendix P.7.4.10 and Section 7.4.10.11 (Section 7.4.10.10 for gutters)(current edition) in conjunction with the 15-minute rainfall value from the National Building Code, Appendix C.

NOTE: See the Standard for additional requirements.

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