How many layers of shingles are allowed on a roof.
Roof layers shingles.
There are some advantages to roofing over existing shingles says dale richards owner of richards roofing in troy michigan.
Benefits of adding multiple shingle layers.
The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says.
Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles.
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California roofing codes establish a list of rules that all builders and contractors must adhere to in order to ensure safe building practices within the state.
Pros to overlaying a shingle roof.
Saving on the initial shingle installation doesn t solve the long term cost of adding a second layer of shingles.
Shingles are the element that most homeowners are familiar with as it is the layer you can see from the outside of your home and it is an important aesthetic aspect.
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.
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California roofing laws cover everything from licensure of the roofing company to the types of shingles that must be used to the slope of the roof.
Asphalt shingles come in two major types 3 tab and architectural.
Most building codes allow this but is it a good idea.
Roofing layers from the framing to the shingles so we ll start at the bottom of the deck and work our way up through all the roofing layers until we reach the shingles and sunshine above your 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.
Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin.
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.
Most building codes allow up to two layers of organic or fiberglass asphalt shingles.
Here are the pros and cons.
Two layers of shingles trap more heat which in turn damages the shingles and shortens the life span of the roof.
Good quality composite shingles can weigh 350 to 450 pounds per square 100 square feet of roofing installed.
That limit pertains to roofs with up to a 4 12 pitch.
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