Installing New Roof Over Existing One

Installing a new roof over an existing one can only be done if you have shingles because you can only put shingles over shingles.

Installing new roof over existing one.

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. Has the same manufacturer s warranty. Old shingles can curl over time. 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.

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. Looks just as good and lasts as long. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.

There s a lot of visible damage. This provides added protection against ice dams. Mold rot or other significant damage needs to be taken care of with a full replacement not hidden by new materials. 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.

Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. It is not possible to mix materials nor to install a new layer over slate or wood tiles. Before you reshingle a roof read our step. Use premade roof trusses premade roofing trusses will be easier and take less time than installing a stick built roof.

The cheapest option would be to leave the old roof in place and place the new rafters over the existing roof. You need a flat surface to install a new roof over existing shingles. Premade trusses will form the skeleton of your new roof above your old roof.