A roof overlay is placing a new layer of shingles over existing ones.
Overlay roof covering.
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When you overlay a new roof you attach the new shingles or other roofing material to the existing roofing material.
An overlay roof occurs when keep your existing roof as is choosing instead to shingle on top of it.
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Overlapping roof coverings.
A flat roof that had been over coated with a liquid based system which itself is breaking down a bonded overlay would not be suitable although with some preparatory works a mechanically fastened overlay system might be an option.
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The best case scenario for an overlay is sound decking.
This has advantages and disadvantages and each of those should be weighed carefully.
Just be aware that the extra layer of shingles will add to the cost of your next roof replacement.
In general overlaying a new roof takes less time less labor and thus less money.
Tpo membranes are a polyester reinforced reflective covering made of a blend of rubber and plastic that can protect your roof from rain and the wind.
Shorter work timeline an overlay can be finished days sooner than a tearoff.
However this can only be done once.
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1 overlaying the new roof over the existing layer of shingles or 2 tearing off the old shingles before installing the new roof.
And a roof with no sidewalls where flashing is needed to tie in the roofing material to the exterior walls of the home.
However if you overlay you cannot install an ice and water leak barrier as it has to adhere directly to the wood decking.
Overlaying will include new flashing and waterproofing materials along with laying shingles.
Typically your builder will provide two options.
Although most people will assume that the second option is best why keep the old and damaged shingles overlaying provides several benefits as well.
No previous or existing leaks.
If you re planning on completely replacing your roof within the next five to 10 years an overlay is a practical way to enjoy the look of a new roof in the meantime.
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Mobile home roof over with single ply tpo white single ply tpo membranes are a very popular choice for mobile homes with flat or low slope roofs.
