How To Tie Existing Roof Shingles To Shingles

I am about to put an addition on my house and the only thing that is keeping me from doing the shingles myself is the tie in to the existing.

How to tie existing roof shingles to shingles.

To tie into the side of an existing roof put a new roof truss on the walls of the addition brace it upright then snap chalklines on the shingles to mark the center line of the new roof valleys where old and new roofs will connect. Now it is time to use a cut valley in order to tie the new shingles in with the old roofing system. The easiest way to tie in the new shingles with the old is with a cut valley see four ways to shingle a valley. I e how big the last ones are i would recommend that you remove enough of the old shingles so that you don t leave the plywood seam the tar paper seam and the shingle seam all stacked on top of one another.

You want to be about two inches above the very center of the valley itself. It really just depends on how the existing roof shingles ended. Up from the valley center and cut through the shingles and underlayment. I will be creating a new valley on one side and tieing into the existing shingles on the other.