Roof Ridge Board Size

Just supported on the outside walls.

Roof ridge board size.

Choose a ridge board that is one size larger than your common rafters. Both cases will have no interior supporting walls or posts and no ceiling joists. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.

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. Is 22 ridge board too long of a span worried about roof sag. Ridge boards can only be used in roofs with slopes from 3 in 12 up to 12 in 12. 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. The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends. Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof. Outside of the u s a degree angle is typically used.

They will have a 10 12 pitch across a 20 ft total span 10 ft from front of wall to ridge. Here s what i have so far. I m currently designing a new garage roof for an existing building and having difficulty finding info on what size ridge beam to choose. 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. The buildings open span length is 6 2 metres from gable wall to gable wall which the ridge beam will sit on and overhang either side by 200mm and 3 3 metres along the building width. 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 instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.