Roof Ridge Board Size

Outside of the u s a degree angle is typically used.

Roof ridge board size.

Ridge boards can only be used in roofs with slopes from 3 in 12 up to 12 in 12. Choose a ridge board that is one size larger than your common rafters. 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.

It is always better to have a large rafter rather than be concerned with a sagging roof. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to. Is 22 ridge board too long of a span worried about roof sag.

I m currently designing a new garage roof for an existing building and having difficulty finding info on what size ridge beam to choose. The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends. Both cases will have no interior supporting walls or posts and no ceiling joists. Just supported on the outside walls.

Could i use a 2 x12 ridge board beam across the 16 width if i use 2 x8 or 2 x10 dimensional lumber rafters. 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. 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. 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.

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Here s what i have so far. They will have a 10 12 pitch across a 20 ft total span 10 ft from front of wall to ridge. Versa lam lvl size chart laminated beam span tables charts.