Installing New Roof Over Existing One

It is not possible to mix materials nor to install a new layer over slate or wood tiles.

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. Before you reshingle a roof read our step. Looks just as good and lasts as long. Old shingles can curl over time.

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. Another reason is curling shingles as you can only install a new layer if the first one is completely flat and level. 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. 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. The cheapest option would be to leave the old roof in place and place the new rafters over the existing roof. Mold rot or other significant damage needs to be taken care of with a full replacement not hidden by new materials.

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. Has the same manufacturer s warranty. Use premade roof trusses premade roofing trusses will be easier and take less time than installing a stick built roof. Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option.

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. There s a lot of visible damage. A properly installed layover roof can look and function as well.