SBS Expansion Joint (Field)

Division D - Construction Details

SBS | Expansion Joint (Field) ( Article 10.3.6.1.)

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SBS Details

(1) Air or Vapour Control Layers: If required by design authority
(2) Insulation: See available insulation products in the Accepted Materials section of this Manual.
(3) Insulation Overlay: As required.
(4) Primary Membrane and Membrane Protection.
(5) Membrane Flashing: Mechanically fasten to top of blocking (C).
(6) Membrane Underlay: Minimum self-adhered modified bitumen or as per membrane manufacturer’s recommended detail.
(7) Metal Counter-flashing: Mechanically fasten to top of wood blocking. Optional on flexible membrane systems. Required on assemblies using gravel ballast filter mats. Also called a base flashing.
(8) Metal Cap Flashing: Top surface must be sloping. Extend beyond and over-break at top corners. Fasten with concealed clip-type fasteners or cladding screws evenly spaced between seams.

(A) Acceptable Supporting Deck Structure
(B) Air / Vapour Seal
(C) Expansion Joint Assembly: Minimum 200 mm (8") and maximum 300 mm (12") above finished roof surface. Minimum height may be reduced to 100mm (4") if the primary roof membrane flashing is fully supported and sealed over the top. Primed where applicable. Top must be sloped.
(D) Flexible Insulation

NOTE: See the Standard for additional requirements.

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