New Rafters Over Existing Roof

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

New rafters over existing roof.

We aren t planning on going up a floor so the roof would only be marginally higher than it is now. The roof sheathing on the old roof is not rotten just not up to the standards my dh thinks it should be. Use premade roof trusses premade roofing trusses will be easier and take less time than installing a stick built roof. This provides added protection against ice dams.

To make the blind valleys we attached sleepers to the shed roof locating them by placing a 14 foot straightedge that is usually used for screeding concrete on top of the porch rafters to project the plane of the new porch roof over to the surface of the existing shed roof. How to tie a additions roof to existing roof roof additions to existing roofs how to construct a roof from an exsisting shead how to change a roof line how to attach a deck roof to existing roof how to add a roof over porch attache porch roof on house attach shed roof to house adding a roof to screened in porch adding a roof to existing. Premade trusses will form the skeleton of your new roof above your old roof. A properly installed layover roof can look and function as well.

However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. To increase the strength of your new and existing rafters and to help eliminate the chances of sideways movement consider installing a support board across the rafter endings on both sides of the roof. Dh is a very skilled carpenter and is confident that he can do this work. Old shingles can curl over time.

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. 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. There s a lot of visible damage.

We are planning to frame the new roof over the existing roof.