Tempo:
(Figure 155). A flexible sheet rubber or neoprene flange placed around the vent stack provides an effective, flexible air seal. It can also move with the vent stack as it contracts and expands with the heat of air within it.
Where soil stacks or large pipes must run horizontally at right angles to the joists, it will be necessary to frame out the joists. To do this, headers are installed between the joists (Figure 156). Alternatively, services are suspended below the joist and enclosed in a bulkhead or dropped ceiling chase.
155 Sealing a plumbing vent below an attic Polyethylene air and vapour barrier on underside of roof framing Wood blocking between roof framing Seal between vent pipe flashing and vapour barrier Prefabricated vent pipe flashing
Plumbing vent pipe
156 Framing for soil-stack pipes drainage piping from washbasin floor joists soil stack header joist floor flange drainage piping from toilet drainage piping from bathtub
Where soil stacks or large pipes must run horizontally at right angles to the joists, it will be necessary to frame out the joists. To do this, headers are installed between the joists (Figure 156). Alternatively, services are suspended below the joist and enclosed in a bulkhead or dropped ceiling chase.
155 Sealing a plumbing vent below an attic Polyethylene air and vapour barrier on underside of roof framing Wood blocking between roof framing Seal between vent pipe flashing and vapour barrier Prefabricated vent pipe flashing
Plumbing vent pipe
156 Framing for soil-stack pipes drainage piping from washbasin floor joists soil stack header joist floor flange drainage piping from toilet drainage piping from bathtub
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