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.

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. We can even help you find a professional to install it. 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.

The five main types of roofing materials are asphalt shingles cedar shakes concrete or ceramic tiles metal sheets and rubber used for flat roofs. 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. 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 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.

Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles. The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says. With applications every five years roof maxx can add up to 15 years of life to an asphalt roof. More than 70 of all houses in north america are covered in asphalt roof shingles.

Here s a closeup view of an asphalt roof shingle. Here are the pros and cons. Pros to overlaying a shingle roof. That limit pertains to roofs with up to a 4 12 pitch.

There are some advantages to roofing over existing shingles says dale richards owner of richards roofing in troy michigan. Ridge vents are at the top of your roof covered by roofing material but with a gap designed to allow warm moist air to escape from the attic. If your decking is less than 3 4 inch then a 1 1 2 inch nail will suffice. While most asphalt shingles are marketed to last between 25 50 years some roofs don t last more than 7 10 years.

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. Most building codes allow this but is it a good idea. Most building codes allow up to two layers of organic or fiberglass asphalt shingles. Owens corning produces high quality asphalt coating asphalt sealants and adhesives for asphalt shingles.