Installing New Roof Over Existing One

Use premade roof trusses premade roofing trusses will be easier and take less time than installing a stick built roof.

Installing new roof over existing one.

Before you reshingle a roof read our step. 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. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.

Mold rot or other significant damage needs to be taken care of with a full replacement not hidden by new materials. There s a lot of visible damage. 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 an existing one can only be done if you have shingles because you can only put shingles over shingles.

Installing a new roof over shingles takes less time than tearing off the old roof. Has the same manufacturer s warranty. Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option. Premade trusses will form the skeleton of your new roof above your 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. 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. 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. This provides added protection against ice dams. Looks just as good and lasts as long.