How To Shingle A New Roof To An Existing Roof

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How to shingle a new roof to an existing roof.

Nail a horizontal row of shingles over the drip edge. Let s start with the good. Continue to nail horizontal rows of shingles onto the roof. You can save.

Hammer the nail into the top part of each shingle. The shingles should jut out from 1 4 to 3 8 inch 7 to 1 cm over the drip edge. The bridging method allows the new course of roof shingles to overlay 2 or 3 courses of the existing roof shingles. It is the process where roofers install a new roof over your existing one i e.

Venting the eaves to vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath. Installation is easier than for a tear off job because you can use the existing shingles as guides for laying the new ones. The goal is to provide a reasonably flat surface for the new shingles to lie over with no gaps greater than 1 2 inch. If a shingle is torn or cracked glue the broken piece back in place using roofing cement.

When roofing over your existing shingles can be a good idea. Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because. Roofing over an existing roof is also called reroofing or an overlay. Fold new shingles over the new valley onto the old roof overlapping by at least a foot.

Each row should overlap the one below it by 1 4 inch 7 cm not less. Then nail shingles on the new roof and exposed areas of the old roof. If the broken piece is lost cut a new piece to fit the existing shingle. Add a new layer of shingles which means that there is no tearing off of the old roof.

Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option a properly installed layover roof can look and function as well. If conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing. Finish your gable roof addition tie in by installing siding to match the existing house and fascia and trim boards at eaves and edges. Why installing new shingles over old shingles can be good.

How to roof over existing shingles.