To Layer On Top Of Each Other Roofs

Steep sloped roof products such as tile slate metal and shakes only allow one layer.

To layer on top of each other roofs.

Understanding the different layers of a roofing system is crucial to having a successful project and positive experience when hiring a roofing contractor. Most cities and towns allow a maximum of two layers of shingles says chad muth president of muth company roofing in westerville ohio. Each part of the system contributes to protecting your home from severe weather. In all use four nails per 3 tab shingle.

You don t have. Asphalt shingles typically can have one more layer added over the top two roofs total. Now you just have to decide whether to remove the existing roof shingles or recover the roof. Decking wood sheathing the decking is the base on which everything else is laid.

A re roof might not look good on an inspection report. Most roof decking is made from sheets of plywood. Having multiple layers of shingles is going to make your roof hotter because the heat gets trapped between the layers which could mean premature aging of the shingles. On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing.

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. Nailing here will cause the next shingle to cover the nail heads and allow the next and subsequent rows of nails in shingles to always penetrate and hold the top edge of the lower row this allows 8 nails to hold each. 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. It s usually a peel and stick product that adheres directly to the roof deck.

Roof deck is the roofing material that sits on top of the roof trusses. For example towns in climates with heavy hailstorm activity or significant ice dam problems may not allow multiple roofing layers. Also place a nail 2 inches from each end of the shingle in line with the other two. Local codes might not allow re roofing.

But contractors who spoke with angie s list say best practices call for stripping the roof down to the wood deck to inspect it before installing a new roof. Two layers is the maximum in most areas but some building codes allow only one. Use 1 5 or 1 75 inch roofing nails. By placing shingles on top of a damaged roof you ll affect the way the roof looks.

More difficult to check deck when you tear off the old roof you get a look at what s underneath. The roof is a system composed of layers of different materials that work together to keep wind and weather out of your home. For many years it was acceptable to put even the third layer. Here are the layers of a roof in order of application bottom to top.