Installing New Roof Over Existing One

The cheapest option would be to leave the old roof in place and place the new rafters over the existing roof.

Installing new roof over existing one.

It is not possible to mix materials nor to install a new layer over slate or wood tiles. 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. Before you reshingle a roof read our step. There s a lot of visible damage.

Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. Old shingles can curl over time. You need a flat surface to install a new roof over existing shingles. Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option.

Mold rot or other significant damage needs to be taken care of with a full replacement not hidden by new materials. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. 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 shingles takes less time than tearing off the old roof.

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 an existing one can only be done if you have shingles because you can only put shingles over shingles. This provides added protection against ice dams. A properly installed layover roof can look and function as well.

Looks just as good and lasts as long. 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. Premade trusses will form the skeleton of your new roof above your old roof.