Asphalt Shingles - Air and Vapour Controls
Asphalt Shingles - Air and Vapour Controls
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Division D - Construction Details
ASh 6.3.1 Air and Vapour Controls (field)
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"All Systems" Details
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1 WORK INCLUDED
- (1) Supporting Deck Overlay
- Recommended over steel decks, to provide continuous support for membrane control layers (this fulfills the requirement for continuity, British Columbia Building Code, Div. B, 5.4.1.2 (3)).
- (2) Air or Vapour Controls
- Self-adhering membrane (typical).
- (3) Metal Support
- For fully or intermittently unsupported side or end laps. Use pre-finished galvanized steel (min. 24 Ga.), fabricated at least 100 mm (4”) wider than membrane overlaps, and secured with compatible flat-head fasteners (two fasteners per flute, or as otherwise specified).
- (4) Long edges
- Centre membrane runs along top flutes of steel deck (applicable when no deck overlay is specified and installed).
- (5) End laps
- Overlap the roll ends at least 100 mm (4”), or as specified by the membrane manufacturer (whichever is greater). End laps must be fully supported by the roof deck or a metal support.
- (6) Side laps
- Overlap membrane side laps at least 50 mm (2”), or as specified by the membrane manufacturer (whichever is greater). Side laps must be fully supported by the roof deck or a metal support.
2 RELATED WORK BY OTHERS
- (A) Acceptable Deck
NOTE: See the Standard for additional requirements.
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