Roof On Top Of Another Roof

Assuming your old roof is in good shape the additional layer can serve as added protection in case a top shingle gets blown off in a storm.

Roof on top of another roof.

If your existing roof is fairly old there s a good chance the shingles are damaged. Place the top of each starter shingle firmly against the bottom of the shingle immediately above it and even with the eaves then nail it into place. 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. Premade trusses will form the skeleton of your new roof above your 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. I was floored when i saw the old shingles. Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin. Let me get this straight your saying they built an entire new roof on top of the original one already in place.

This was a first. By placing shingles on top of a damaged roof you ll affect the way the roof looks. The shingles likely won t last as long so the job could actually end up costing you more in the long run. Since it s being put on top of another less than perfect roof it s likely that it may not look as good as a brand new roof would.

Shingles that are raised or misshapen make it hard to lay a smooth flat layer of new shingles on top. Was inspecting a home on the old navy base in orlando and when accessing the attic they had placed a new roof trusses and all on top of the old roof. If there are any pros to overlaying a roof it s saving a little bit of money. A common house roof pitch is 5 by 12 which means it slopes up from the wall at 5 inches per foot.

Use 1 5 or 1 75 inch roofing nails. More difficult to check deck when you tear off the old roof you get a look at what s underneath. But because of the amount of prep work involved in overlaying a roof properly any savings are usually modest maybe 25 percent compared to a new roof. Unfortunately the money you save by avoiding a full roof replacement comes out of the value of your house.