How To Shingle A New Roof To An Existing Roof

The goal is to provide a reasonably flat surface for the new shingles to lie over with no gaps greater than 1 2 inch.

How to shingle a new roof to an existing roof. Each row should overlap the one below it by 1 4 inch 7 cm not less. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. The bridging method allows the new course of roof shingles to overlay 2 or 3 courses of the existing roof shingles. When roofing over your existing shingles can be a good idea.

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. This method usually allows for the proper exposure of the roof shingles and is commonly used when applying metric sized roof shingles over english sized or over wood shingles. Fold new shingles over the new valley onto the old roof overlapping by at least a foot. The shingles should jut out from 1 4 to 3 8 inch 7 to 1 cm over the drip edge.

Continue to nail horizontal rows of shingles onto the roof. How to roof over existing shingles. It is the process where roofers install a new roof over your existing one i e. Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because.

You can save. Finish your gable roof addition tie in by installing siding to match the existing house and fascia and trim boards at eaves and edges. Add a new layer of shingles which means that there is no tearing off of the old roof. If a shingle is torn or cracked glue the broken piece back in place using roofing cement.

Then nail shingles on the new roof and exposed areas of the old roof. If conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing. Nail a horizontal row of shingles over the drip edge. Roofing over an existing roof is also called reroofing or an overlay.

When you should tear off your roof and start from scratch instead. If the broken piece is lost cut a new piece to fit the existing shingle. Let s start with the good. 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.

Hammer the nail into the top part of each shingle.