Roofing Shingles Over Old

Good quality composite shingles can weigh 350 to 450 pounds per square 100 square feet of.

Roofing shingles over old.

This means the total roof weight was probably greater when the previous layer of shingles was installed than the new metal roofing. Roofing second layer of shingles roofing. Because asphalt shingles are routinely exposed 5 in rip down the first strip the starter course so that it is 5 in. Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one.

Doing it now will make it easier to keep the reroofing job clean. The felt should be secured every six inches with nails or staples. Damaged shingles should be removed to check the decking for problems. 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.

Leave the old valley flashing in place and install new over it. Remove air vents and pipe flashings by prying out or unscrewing the fasteners holding the fixture. Install a layer of roofing felt over the roof before you begin installing the new shingles. Shingles are designed for flat surfaces.

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. But if the current. If a shingle is. Step 3 cover the old shingles.

How to do it remove caps. Asphalt over asphalt is not advisable. They don t do a good job of bridging over gaps dips or humps including the. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h.

Why not add new roof shingles over old. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. Use a flat pry bar. 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.