The anatomy of a roof

Most of the contractors in the roofing contractors wilmington nc will be able to let you know about a roof’s anatomy. With such knowledge, you will analyze the problem with your roof and make the necessary repairs or call a professional contractor to come and do it.

What is under roofing shingles

By looking at the roof surface, you will think that it is a simple shingle layering, but you will be shocked to learn that, it is very complex than an average homeowner might realize. The roof is a whole system with several layers of various materials that work together to ensure the weather and wind are kept at bay from your home. Each layer has a specific role, and when you combine them with the rest of the component, it provides great protection for your home.

Wood sheathing – decking

Wood sheathing or decking is the roof base where everything else ends up being laid. The decking materials tend to vary but most homeowners use oriented strand board – the OSB or the plywood. Still, other materials are available on the market, including metal decking, concrete, and polystyrene.  The decking is attached using nails on the rafters, which then creates the roof system foundation.


The underlayment is what is installed on the decking before the asphalt shingles are installed. The most common type is felt, which is a paper that is durably saturated with asphalt. It gives out a temporal barrier to wind and rain before the installation of the shingles, providing an extra layer of protection in case of torn or broken shingles.

The underlayment is normally rolled on the roof horizontally. At the roof’s bottom edge is where the installation begins. Each underlayment layer is rolled with a strong overlap helping the shedding of water downward without seeping through the seams.

Drip edge

Also referred to as eave flashing comprises aluminum strips that are angled into a place over the underlayment on the roof side at the edges and beneath the eaves underlayment. The drip edge prevents water from building up and ensures that it is guided over the eaves and the gutters.

The shingles, whether metal, asphalt, clay, or whatever material, comprise the outer shell of the home’s roofing system. It is a system when fully installed and properly working, provides the home with the protection that is required for it to withstand all except the worst weather.

Purpose of roof flashing

Because moisture can be the worst enemy of a roof, there is a need for roof flushing to prevent leakage, thereby extending the overall roof life. Although might sound high tech, roof flashing is all about a sheet of metal constructed from aluminum or steel galvanized.

It is normally placed strategically over the roof joints and construction of the wall to prevent water from entering the home. It is very important, especially if you consider one of the reasons why roof leak is because of a fault in the roof flashing.

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