Installing New Roof Over Existing One

Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option.

Installing new roof over existing one.

Some roofers install a layer of waterproof shingle underlayment wsu over the existing shingles at the eave end as would be done for a roof laid on bare sheathing. It is not possible to mix materials nor to install a new layer over slate or wood tiles. Premade trusses will form the skeleton of your new roof above your old roof. Installing a new roof over an existing one can only be done if you have shingles because you can only put shingles over shingles.

There s a lot of visible damage. This provides added protection against ice dams. You need a flat surface to install a new roof over existing shingles. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.

Installing a new roof over shingles takes less time than tearing off the old roof. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. Use premade roof trusses premade roofing trusses will be easier and take less time than installing a stick built roof. Old shingles can curl over time.

A properly installed layover roof can look and function as well. Before you reshingle a roof read our step. 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. Has the same manufacturer s warranty.

The installation of metal roofing is often easier and faster than other roof types and because of its simple design and generally large size can actually be installed directly on top of existing roofing materials like asphalt shingles and foam roofing. 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. Another reason is curling shingles as you can only install a new layer if the first one is completely flat and level.