I have a 3/12 pitch roof (3 inch's of rise for each 12 inch's of run). I am installing Facia Board (1x8 pine) and my question concerns the proper angle cut at the ridge of the roof. The right angle triangle by definition of the 3/12 pitch has a 90degree angle at the top plate center, a 14degree angle at the eave and a 76degree angle at the ridge (for a total of 180degrees in the right triangle)
Vision a gable roof and the two right triangles would fit against each other and form the gable. The two 76degree angles would be together at the ridge of the roof. What would the plumb cut be in degrees for the facia board on the ridge? I thought that with two 76degree angles combined that I would split that in half for the cut, but obviously that is wrong. The angle cut is not 76degrees and my miter saw wouldn't cut that anyway. I think the angle cut may be 14degrees for each of the facia boards joining at the ridge on the two 76degree angles, but I don't know why I think that or how the angle is actually calculated.
Thanks for any assistance with the angle cut.
David