Roofing Shingles Over Old

But unless the sheathing is extensively damaged or the structure can t support the weight of another layer of roofing a better solution is to apply a new layer of shingles right over the old one.

Roofing shingles over old.

How to do it remove caps. Install a layer of roofing felt over the roof before you begin installing the new shingles. One important thing to remember when you re deciding what type of roof to buy is that new asphalt shingles shouldn t be placed on top of old asphalt shingles. This means the total roof weight was probably greater when the previous layer of shingles was installed than the new metal roofing.

Damaged decking will need to be repaired before you can install any new shingles. If a shingle is. But if the current. Doing it now will make it easier to keep the reroofing job clean.

They don t do a good job of bridging over gaps dips or humps including the. Because asphalt shingles are routinely exposed 5 in rip down the first strip the starter course so that it is 5 in. Remove air vents and pipe flashings by prying out or unscrewing the fasteners holding the fixture. Done correctly a reroof job will look as good and last as long as a new roof for a lot less money and a lot less hassle.

Leave the old valley flashing in place and install new over it. Remove the ridge caps. The felt should be secured every six inches with nails or staples. Why not add new roof shingles over old.

Good quality composite shingles can weigh 350 to 450 pounds per square 100 square feet of. Roofing second layer of shingles roofing. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. Step 3 cover the old shingles.

Asphalt over asphalt is not advisable. Damaged shingles should be removed to check the decking for problems. Shingles are designed for flat surfaces. When tearing off the old roof is a better option there are already two layers of shingles on your roof most building codes only allow two layers of any type of roofing.