Roof Ridge Board Size

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Roof ridge board size.

Ridge boards can only be used in roofs with slopes from 3 in 12 up to 12 in 12. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. Versa lam lvl size chart laminated beam span tables charts.

Ridge boards shall be at least 1 inch nominal thickness and not less in depth than the cut end of the rafter irc section r802 3. Choose a ridge board that is one size larger than your common rafters. Some say i can use my 9 1 2 i beams for rafters and a single 2 x12 ridge board across the 16 span at the ridge. For 2 x 6 rafters use a 2 x 8 ridge board and so on.

It is always better to have a large rafter rather than be concerned with a sagging roof. Is 22 ridge board too long of a span worried about roof sag. A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to. Others are saying i need an lvl ridge beam.

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. I have read that a ridge board beam when used with wood i joists for rafters should have a ridge board beam that can support the entire roof load since the i beams are not designed to tolerate the compression that can occur in my situation.