Roof Ridge Board Size

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.

Roof ridge board size.

Could i use a 2 x12 ridge board beam across the 16 width if i use 2 x8 or 2 x10 dimensional lumber rafters. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Outside of the u s a degree angle is typically used. 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 4 rafters use a 2 x 6 ridge board. Rafter to ridge beam connection framing roof ceiling construction structural ridge beam absolute deflection in a ridge beam structural ridge beam tricks of the trade. Here s what i have so far. 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. Both cases will have no interior supporting walls or posts and no ceiling joists. 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.

Is 22 ridge board too long of a span worried about roof sag. For 2 x 6 rafters use a 2 x 8 ridge board and so on. Versa lam lvl size chart laminated beam span tables charts. It is always better to have a large rafter rather than be concerned with a sagging roof.

Just supported on the outside walls. 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. 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. The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends.