The Layers That Make Up Your Asphalt Shingle Roof

16 April 2019
 Categories: , Blog


Think you have a problem with your roof? If so, do not automatically assume the problem is with the shingles. There are several layers of materials that come together to form a roof, and the problem could be with any of them. Here is what you need to know about the layers of your asphalt shingle roof.

The Trusses

The trusses form the base of your roof, which all other roofing materials are built on. They need to be strong enough to support the roofing material that you use, which is why it is difficult to upgrade to heavy roofing materials later on. It is common to construct the trusses according to the materials that will be used for the roof at the time it is built.

The Roof Deck

The layer attached to the trusses is known as the roof deck, and it is essentially oriented strand board (OSB) that is attached to the trusses. This turns the thin boards of the trusses into a flat layer to install the other roofing material.

The Foam Insulation

There will be a layer of foam insulation installed on top of the roof deck, which is designed to give your home additional thermal protection and reduce the amount of energy waste from your HVAC system.

The Roofing Paper

On top of the foam insulation will be a layer of roofing paper. This is designed to act as a waterproof membrane to protect the inside of your home in case there is a leak. If water somehow finds a way underneath the shingles, the roofing paper will help prevent water damage from occurring.

The Starter Shingles

A layer of starter shingles will be placed at the bottom of your roof, which helps protect the eaves from water damage. This is a very important layer to have if you are installing asphalt shingles, since the starter strip of shingles helps provide more protection from water.

The Asphalt Shingles

The asphalt shingles can now cover the entire surface of the roof, creating an overlapping pattern that allows water to roll off the surface and into the gutters. It goes directly over the roofing paper and overlaps with the starter shingle strip.

The Flashing

Any time that an object sticks out of your roof, flashing is used around the edges to prevent water from getting underneath the shingles. Flashing is typically made out of metal and will wrap around the object and be secured with roofing cement.

Now that you have a better understanding of the layers of your roof, you can better understand roof leaks. Contact a roofing service for more information or for assistance with your roof.