SBS Membrane Termination (New Construction)

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SBS Membrane Termination (New Construction)

Division D - Construction Details

SBS | Membrane Termination (New Construction) ( Article

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SBS Details

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(1) Air or Vapour Control Layers
The requirement for a vapour retarder is determined by the design authority.
(2) Insulation
See available insulation products in the Accepted Materials section of this Manual.
(3) Insulation Overlay
Where required.
(4) Primary Membrane and Membrane Protection
(5) Membrane Flashing
Mechanically fasten to inside of plywood.
(6) Membrane Counter-flashing
Flashing sealed to wall with compatible mastic.
(7) Metal Base Flashing
Optional on flexible membrane systems. Required on assemblies using gravel ballast filter mats.
(8) Metal Counter-flashing
Into reglet approximately 30 mm (1 ¼") and caulked.
(9) Caulking
(10) Membrane Underlay
Minimum self-adhered modified bitumen membrane.
(11) Metal Cap Flashing
Fasten with continuous concealed clip-type fasteners or cladding screws evenly spaced between seams.


(A) Acceptable Supporting Deck Structure
(B) Air and Vapour Control Layer Seal
Sealed to wall.
(C) Plywood
(D) Reglet
Purpose-made, installed prior to concrete placement or saw-cut.
(E) Sloped Wood Blocking
Required over 100 mm (4") parapet width.

NOTE: See the Standard for additional requirements.

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