How Roofs Work
A roof actually consists of several layers working together to protect and beautify a home. Knowing the layout of your roof will help you better understand how and why problems can occur. Here is how the system works from A to D (A being the top layer, D the bottom):
Layer A: The visible shingle on the top
roof layer consisting of the shake, tile or metal shingle.
Layer B: The roof deck, which is nailed
to the rafters and can be constructed of plywood or other materials.
It also serves as an insulating device and can decrease energy usage
as a result.
Layer C: The underlayment, which is usually
a sheet of felt to help deflect any water that seeps through a crack
in a shingle. The felts can be different grades and are sometimes
reinforced with fiberglass.
Layer D: Aluminum strips to help block
weather damage from wind and rain. These are installed along the
sides of the roofs and at the eaves.
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