Pros to overlaying a shingle roof.
Asphalt shingle roof layers.
While most asphalt shingles are marketed to last between 25 50 years some roofs don t last more than 7 10 years.
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.
That limit pertains to roofs with up to a 4 12 pitch.
The five main types of roofing materials are asphalt shingles cedar shakes concrete or ceramic tiles metal sheets and rubber used for flat roofs.
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.
Most building codes allow up to two layers of organic or fiberglass 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.
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.
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.
The top surface of the shingle includes a granule mineral coating.
Here are the pros and cons.
Experience the total owens corning roofing system and high quality roofing shingles.
Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles.
If your decking is less than 3 4 inch then a 1 1 2 inch nail will suffice.
There are a variety of factors that affect the lifespan of your roof including climate roof design installation and material.
Owens corning produces high quality asphalt coating asphalt sealants and adhesives for asphalt shingles.
With applications every five years roof maxx can add up to 15 years of life to an asphalt roof.
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.
This type of roof shingle consist of a fiberglass mat saturated on both sides with hot asphalt.
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.
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 homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says.
Most building codes allow this but is it a good idea.
