According to Fixr, you should expect to spend $50 to $450 per truss. The cost for a project like this depends on the size of your roof. If water is continuously leaking into your home, irreparable damage, mold, and mildew will form. If you don’t tie in a roof to an existing roof, you risk the possibility of air and moisture seeping into your home’s structure because of openings in your roof. Why Should You Tie into an Existing Roof? Finally, secure each shingle by laying down a 2-inch-wide roofing cement 4 inches up from the valley’s center. Next, grab your labeled shingles and reinstall them. When installing shingles where the new valley meets the existing roof, make sure the shingles touch both surfaces by at least a foot. You will use these later, so remember to number them and set them aside.īegin by laying shingles along the edges of the roof and use snapping lines to ensure proper spacing. Start by removing two shingles from each side of the new valley and continue removing them until you reach the bottom. Now, strip the shingles in this area and lay more waterproof underlayment over the site. You will want to lay down a snapping line two inches up from the valley board on the old shingles. Step 4: Remove the Shingles near the Valley Board See also Can You Use Roofing Nails for Siding?Īfter securing the sheathing, lay a waterproof underlayment over the sheathing. For the nails, place them six inches apart and about 3/8th inches from the edge of each plywood sheathing. When placing the sheathing, leave a 1/8th inch gap between each piece. Make sure to use nails that are the proper size to penetrate the plywood and valley board. Next, install plywood sheathing on the new valley board with nails. This helps prevent leaks from occuring later on. 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 Can I Walk On My Mobile Home Roof? Steps to Tie a New Roof to an Existing Roof Step 1: Frame the Roof
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