Installing New Roof Over Existing One

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 new roof over existing one.

This provides added protection against ice dams. Installing a new roof over an existing one can only be done if you have shingles because you can only put shingles over shingles. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. Old shingles can curl over time.

Looks just as good and lasts as long. 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. Installing a new roof over shingles takes less time than tearing off the old roof.

There s a lot of visible damage. Another reason is curling shingles as you can only install a new layer if the first one is completely flat and level. 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.

Mold rot or other significant damage needs to be taken care of with a full replacement not hidden by new materials. It is not possible to mix materials nor to install a new layer over slate or wood tiles. A properly installed layover roof can look and function as well. 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.

Before you reshingle a roof read our step. You need a flat surface to install a new roof over existing shingles. 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.