Originally Posted by Joe Carola
That's pretty much what I did except the rafter was not shortened at the top.
This might be more than you want to read so feel free to skip it.
The garage is 24X28 with a 6/12 slope.
I used a speed square for all the plumb lines.
Starting with the commons, I made the plumb cut at the top.
I measured down along the top edge, 161" and made the wall plumb line.
I moved the wall plumb line to shorten the rafter half the ridge or 3/4" 90deg to the plumb line. Than positioned the square to mark a 2" seat cut.
Than to fit over the sheathing I extended the seat cut 1/2" beyond the plumb line. Than cut it.
The ridge board is 49 1/2" or 1 rafter thickness longer then the lenght - width of the building.
I built a scaffold in the center so I could work at the ridge. I didn't do anything to set the height of the ridge except nailing 2 commons on one side and raising it till it was plumb with a small level.
The commons and ridge all fit together nicely.
For the hips I made the double cheek cut at the top.
Measured along the top edge from the point of the cheek cut, 216" and made the wall plumb line.
Moved the wall plumb line 1 1/16" to shorten 1/2 the 45 degree ridge thickness.
Marked the HAP along a line 3/4" in from the shortened plumb line.
Marked the seat at this HAP point and cut the seat to the shortened plumb line.
I trimmed the sheathing at the corners so I did not extend the hip seat cut to clear the sheathing like I did the commons.
The hips are or fit as if, they are too long.