Installing New Roof Over Old

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.

Installing new roof over old.

Installing a new roof over shingles takes less time than tearing off the old roof. As long as it s done right and under the right conditions installing new shingles over old ones can last as long and look just as good as a complete re roof. Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option. Along the rakes install a new j channel drip edge which wraps around the old rake flashing and starter courses.

Looks just as good and lasts as long. Has the same manufacturer s warranty. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. If conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing.

Manufacturers will still warranty the roof for the same amount of time as a re roof as long as it s done by a qualified installer. A properly installed layover roof can look and function as well. Installation is easier than for a tear off job because you can use the existing shingles as guides for laying the new ones.