New Roof Over 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.

New roof over old roof.

This new roof with a higher pitch can be accomplished with premade roof trusses and typical asphalt shingles. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. Why installing new shingles over old shingles can be good. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.

Let s start with the good. It can save you money at the time but it might actually end up costing you more in the long run. You can save money because there s no dump fee for removing your old roofing and there s no need for additional felt paper over the old roof. That s also why building codes commonly limit re roofing to no more than two layers.

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. Replacing a roof can be expensive but if a roof contains only a small slope it s possible to raise the roof pitch of a house by building a roof over the old one.