Interior wall tie roof rafter3/20/2024 ![]() With your valley board nailed down, you should put roofing cement on the nails and along the outside edges, where the valley board touches the existing roof. Then, you can use a calculator to determine the angle. ![]() To measure the pitch, measure the distance between the ridge and wall and the roof’s rise. But, first, you will need to calculate the roof pitch, which is the slope of the existing roof. Now, you can install a valley board to the existing roof. However, it might be wise to remove them if they’re not in good condition. ![]() Whether or not you decide to strip the old shingles is your preference. You can remove the shingles in the marked area since that is the area that the roof from the new addition will cover. Also, mark the shingles with chalk lines to indicate the area where the new valley goes. Set your trusses or rafters up on the new roof so they match up with the eaves of the existing roof. See also Why are Roofs Black? (What You Need to Know) Steps to Tie a New Roof to an Existing Roof Step 1: Frame the Roof
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