Roof Ridge Board Size

A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to.

Roof ridge board size.

The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends. 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. 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. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. 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. Versa lam lvl size chart laminated beam span tables charts. Ridge boards can only be used in roofs with slopes from 3 in 12 up to 12 in 12. Outside of the u s a degree angle is typically used.

For 2 x 4 rafters use a 2 x 6 ridge board. 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.