Roof Ridge Board Size

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Roof ridge board size.

For 2 x 6 rafters use a 2 x 8 ridge board and so on. The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends. Others are saying i need an lvl ridge beam. 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.

Is 22 ridge board too long of a span worried about roof sag. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to.

Versa lam lvl size chart laminated beam span tables charts. 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. 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.

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. Ridge boards can only be used in roofs with slopes from 3 in 12 up to 12 in 12.