Roof On Top Of Another Roof

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.

Roof on top of another roof.

If there are any pros to overlaying a roof it s saving a little bit of money. Unfortunately the money you save by avoiding a full roof replacement comes out of the value of your house. 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. Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin.

If your existing roof is fairly old there s a good chance the shingles are damaged. Premade trusses will form the skeleton of your new roof above your old roof. Make sure the pitch of the trusses is the pitch that you want for your new roof. 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. 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. 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. Shingles that are raised or misshapen make it hard to lay a smooth flat layer of new shingles on top.

By placing shingles on top of a damaged roof you ll affect the way the roof looks. This was a first. More difficult to check deck when you tear off the old roof you get a look at what s underneath. The shingles likely won t last as long so the job could actually end up costing you more in the long run.

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. As you can see there are many benefits to installing a new roof over your existing one and we do many of these for arizona homeowners. I was floored when i saw the old shingles. Let me get this straight your saying they built an entire new roof on top of the original one already in place.