Framing A New Roof Over An Old Roof

Installing new roof shingles over old effectively doubles the weight of the roofing so you have to make sure your roof structure can handle the extra load.

Framing a new roof over an old roof.

Shingles that are raised or misshapen make it hard to lay a smooth flat layer of new shingles on top. When necessary to tie the new rafters into the house framing the workers cut into the old roof to make the secure connections. However building the roof will be easier if there are two people working on the roof together. Anyone with basic carpentry skills can build a roof over a mobile home.

A roof over a mobile home can also help prevent damage from falling tree limbs as well as cut down on the annoying noise of hearing heavy raindrops falling on the roof. Box beam gable framing new gable overhang is framed in the form of a box beam hanging off of a new layer of roof plywood roof sheathing cantilevered over the top of the 3 layers of rigid insulation. You can frame a new roof over the old but it will need to be designed for the span and pitch. That s also why building codes commonly limit re roofing to no more than two layers.

Putting a new roof over a leaking roof won t remove the leaks. A layer of old deteriorating shingles can make your new roof look bad. You re better off removing the old roof. Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option a properly installed layover roof can look and function as well.

While it might look possible to use the old ceiling joists they would need to be grade checked to make sure they meet the present code. Replacing a roof can be expensive but if a roof contains only a small slope it s possible to raise the roof pitch of a house by building a roof over the old one. The sheathing must be stripped from the old roof for a couple feet along the bottom to get the new ceiling joists in. Your roof leaks when it rains if your roof is leaking it s usually better to get rid of the old roof so you can find the source of the problems and fix them.

If your existing roof is fairly old there s a good chance the shingles are damaged. And the variables of design don t stop there the builder must determine the pitch or slope of the roof and use that measurement to figure the total rise from the wall s cap plate to the roof ridge.