Asphalt Shingle Roof Layers

Most building codes allow two layers of organic or fiberglass asphalt shingles on roofs with a 4 12 pitch or less and three layers on steeper roofs.

Asphalt shingle roof layers. This type of roof shingle consist of a fiberglass mat saturated on both sides with hot asphalt. 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. If the structure can support the added weight a typical 20 square 2 000 square foot reroof will cost at least 1 000 less than a tear off job. That limit pertains to roofs with up to a 4 12 pitch.

The top surface of the shingle includes a granule mineral coating. 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. When it s time to replace your roof there are several factors that might lead your roofing professional to recommend adding shingles on top of your existing layers. There are some advantages to roofing over existing shingles says dale richards owner of richards roofing in troy michigan.

With applications every five years roof maxx can add up to 15 years of life to an asphalt roof. Here s a closeup view of an asphalt roof shingle. There are a variety of factors that affect the lifespan of your roof including climate roof design installation and material. Experience the total owens corning roofing system and high quality roofing shingles.

Fortunately roof maxx s revolutionary new technology uses 100 natural plant based bio oil to restore shingles flexibility and instantly add five years of life to a roof. While most asphalt shingles are marketed to last between 25 50 years some roofs don t last more than 7 10 years. Pros to overlaying a shingle roof. The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says.

Owens corning produces high quality asphalt coating asphalt sealants and adhesives for asphalt shingles. Let owens corning help you determine when it is time for a new roof and then let us help you choose the shingles for your roof that are right for you. We can even help you find a professional to install it. Most building codes allow up to two layers of organic or fiberglass asphalt shingles.

Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles. More than 70 of all houses in north america are covered in asphalt roof shingles. Here are the pros and cons. Most building codes allow this but is it a good idea.