Difference between revisions of "ASM Air and Vapour Controls (Field)"

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Difference between revisions of "ASM Air and Vapour Controls (Field)"

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Revision as of 14:34, 30 August 2021

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.

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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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