23
Rafters are 16" on center. Trusses are 24" on center. Or 450mm & 600mm australia
For wood framing it can be 16", 19 1/4" or 24 " on center.
You still need to indicate the pitch, the roof sheathing, and the shingle weight.
Rafters are usually on 2 ft. centers.
The frame should be checked prior to the rafters going on. Once the roof is on , you will just have to deal with what you have. The horse is out of the barn...
Rafters are 16" on center. Trusses are 24" on center. Or 450mm & 600mm australia
For wood framing it can be 16", 19 1/4" or 24 " on center.
You still need to indicate the pitch, the roof sheathing, and the shingle weight.
You can see the rafters of the roof very clearly here.
At the peak of the roof where the rafters meet instead of the rafters meeting each other, there is a beam between them that they rest against. It runs the length of the roof peak.
To seal the ridge from weather. If a ridge vent is used it is just that, a vent for the roof.
in need of rafters on my roof,before i can have it weatherized
A longitudinal member in a roof frame, usually for supporting common rafters or the like between the plate and the ridge. One of several horizontal timbers supporting the rafters of a roof. http://www.bw-industries.co.uk/roof-purlins.htm
A purlin is a structural part of a roof which is used to support rafters and carry the roof cladding By supporting the rafters they allow for longer roof spans to be created allowing for wider buildings to be created.
A longitudinal member in a roof frame, usually for supporting common rafters or the like between the plate and the ridge. One of several horizontal timbers supporting the rafters of a roof. http://www.bw-industries.co.uk/roof-purlins.htm
It is true that no ridge board is needed if the pitch is steep and rafters are directly opposed. This is the only time a ridge board is not needed.
If you had a 4/12 pitch and the ridge was running the 20' direction and you were planning on a 12" overhang, your 2x6 rafters would be just shy of 9'-6" each. If your framing is 16" on center you will need 34 of them.