Layers Of A Shingle Roof

Roofing layers from the framing to the shingles.

Layers of a shingle roof.

Let s also assume there are already two existing layers of shingles meaning the old roof needs to be torn off and disposed of. Framing includes the roof trusses that sit at the top of your house and support the weight of all the materials used to build your roof. Most building codes allow this but is it a good idea. Adding this membrane isn t an option with a re roof and the extra layer of shingles offers little protection against ice dams.

Pros to overlaying a shingle roof. If you are putting a layer of asphalt shingles over an existing layer of asphalt shingles on to a 3 4 inch deck or a plank deck then you should be using 1 1 2 inch nails. 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. First of all multiple layers of shingles simply means layering a new asphalt shingle roof on top of the old one rather than stripping the roof completely to expose the sheathing and replacing it with new shingles.

Re roofing may affect the warranty on the new shingles. Roof covering typically of flat and rectangular shapes and made of various materials such as slate wood flagstone plastic metal and composite materials. At 32 000 to replace 37 squares of architectural shingles we have 32 000 37 squares. This provides added protection against ice dams.

However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. Shingles protect sloping rooftops from the effects of rain snow and hail while providing an attractive crown for the house. 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. Apply a liberal amount of plastic roof cement at the base of any fixtures plumbing pipes or roof vents which break the plane of the roof surface.

Doing it properly will keep you without problems for 20 or 40 years. If your decking is less than 3 4 inch then a 1 1 2 inch nail will suffice. Keeping a solid roofing layer of shingles is an important way to avoid water damage and leaks. Most cities and towns allow a maximum of two layers of shingles says chad muth president of muth company roofing in westerville ohio.

When shingles laying on two roof planes approach each other in a valley weave the layers of shingles across the valley to create an integrated unbroken water barrier across the valley. Based on the information you provided this quote seems very high for a roof replacement on a simple single story ranch. Here are the pros and cons. It is a waterproofing layer made of regular felt stacked above the solid decking board and then completely covered by the shingles or other roofing materials.