Install Roof Shingles Over Top Old Roof Shingles

Install a layer of roofing felt over the roof before you begin installing the new shingles.

Install roof shingles over top old roof shingles.

Why installing new shingles over old shingles can be good. Let s start with the good. At the eave and the rake install u shape drip edge flashing made for reroof jobs. Can you put new asphalt roof shingles right over old ones.

Install the eave piece first then the rake piece over it. Drive nails at high points on the underlying roof the bottoms of the shingles. Putting new asphalt roof shingles right over old ones. Use 1 5 or 1 75 inch roofing nails.

When you should tear off your roof and start from scratch instead. You can save money because there s no dump fee for removing your old roofing and there s no need for additional felt paper over the old roof. Installing new roof shingles over old effectively doubles the weight of the roofing so you have to make sure your roof structure can handle the extra load. Place the top of each starter shingle firmly against the bottom of the shingle immediately above it and even with the eaves then nail it into place.

Damaged shingles should be removed to check the decking for problems. The felt should be secured every six inches with nails or staples. When roofing over your existing shingles can be a good idea. Step 3 cover the old shingles.

If the old ones are flat and you fill in any missing tabs and you do no more that a total of two layers of shingles yes you can reshingle over old shingles. That s also why building codes commonly limit re roofing to no more than two layers.