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[SEAOC] RE: [SEAOC] ridge vent in wood roof diaphragm[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc <seaoc(--nospam--at)power.net>
- Subject: [SEAOC] RE: [SEAOC] ridge vent in wood roof diaphragm
- From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
- Date: Wed, 11 Sep 96 17:53:00 PDT
- Encoding: 53 TEXT
When you calculate the actual openings that are required, you will find that a drilled hole is adequate for proper ventilation. Connect the sheathing to the ridge and to the blocking at the perimeter walls. Drill a hole just outside of the ridge and through the solid blocking at the perimeter wall. Or place the perimeter wall blocking between alternate roof joists. A hole size of about 1 or 1 1/2" diameter will often be sufficient without significantly altering the diaphragm capacity. Harold Sprague Black & Veatch ---------- From: seaoc To: seaoc(--nospam--at)power.net Subject: [SEAOC] ridge vent in wood roof diaphragm Date: Wednesday, September 11, 1996 3:52PM On pitched (gabled) wood roofs using plywood sheathing over either prefabricated wood trusses or stick-built rafter framing there quite often is a continuous ridge vent, which requires a continuous opening in the diaphragm a couple of inches wide along the ridgeline of the roof. 1. Does anyone have advice on how forces in the diaphragm are handled at this opening? In conjunction with the ridge vent (for air flow out), there often are continuous soffit vents (for air flow in) to provide the code-required ventilation of the attic space. Blocking in the spaces between the trusses for tranfer of diaphragm forces to the top plate unfortunately blocks this air flow. 2. Does anyone have advice on how these two conflicting requirements (structural force transfer vs. architectural ventilation requirements) can be handled? Rick Burch Columbia, SC ... ...
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