03:40PM | 07/28/03
Member Since: 08/13/01
13 lifetime posts
Is there an easy way to lay out rafters when you have a ridge board and wall in place? I find myself constantly fussing the angle where the rafter meets the ridge and the position of the bird's mouth and of course changing one affects the other.


05:11AM | 07/31/03
Member Since: 08/13/01
13 lifetime posts
So I think I have answered my own question: rafter tables. Although I don't have any and don't know where to get them (although I recall some tables stamped on the back of larger framing squares).

In a pinch I resorted to some good old geometry, which was easy enough but did require things like knowing how to calculate angles etc.


07:54AM | 07/31/03
Member Since: 12/27/02
543 lifetime posts
That isn't a question you can answer in a couple of lines, or a forum even... there are quite a few good roofing books that will show you the steps and aspects of roof framing & layout. You are right, you use a framing square or a speed square.
Here is a site to look at:

As far as your ridge connection that has to do with the square & level of the building if you are cutting the commons the same.

I think the best bet for you would be to go and buy a Swanson Speed Square with the "blue book"

As far as the math goes there are construction calcualtors that all you do is put in the run & rise it will tell you the rafter length, angles, steps, etc.

On my site as well there are a few projects that go through the roof framing step by step with images.

Alter Eagle Construction & Design



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