What Are The Parts Of A Roof?

What are the parts of a roof

You probably only see your roof from a distance, but even then, you’re only seeing the outer part. Let’s peel back the shingles and look at everything that makes up your roof.

Roofing Deck

Think of the roof deck as the foundation of the entire roofing system. It’s usually made of plywood or composite materials like oriented strand boards. All other roofing materials are nailed on the roofing deck, and you’ve probably seen it from your artic.

The roof deck has to carry the weight of the other materials and is the final protection layer for your home. Therefore, it has to be strong and well protected.


The roofing underlayment is applied directly on the roofing deck. It’s an additional waterproof or water-resistant layer that provides protection to the crucial plywood surface. Underlayment is also used under the shingles.

It works as a breathable, water-resistant barrier that can also be fire-rated to help reduce the spread of fire in your house. Common types of underlayment include asphalt-saturated felt, rubber asphalt, and non-bitumen synthetic.


Flashing refers to the corrosion-resistant metal applied to your roof at the edge of the walls. The edges are often called eaves if they extend beyond the walls of your home and valleys, which are the low angled areas formed where two sloping roof planes intersect.

Materials like aluminum, galvanized steel, stainless steel, terne, or copper are used or flashing. Flashing is essential as it helps the roof get rid of water.


Your roof needs to breathe, and ventilation is critical for your whole roof system. Ventilation allows the flow of air under your roof. A correctly ventilated roof allows warm, moist air to escape while allowing dry, cool air to enter the attic space of your home.

With proper ventilation, you’ll experience fewer temperature changes in your home, and moisture will easily escape, so it doesn’t affect your roof from the inside out.


Shingles are the first line of defense and the outermost part of your roof. Most Americans homes use asphalt shingles or asphalt-related materials. They can last you between 20 to 30 years or longer with shaker-style asphalt shingles.

Shingles give your house character and come in a variety of colors, styles, and textures. If asphalt isn’t your cup of tea, you can choose metal, ceramic tile, or slate shingles.

If you are in need of Marietta roofers, give Stable Roofs a call, and we will provide you with a free roof inspection as well as a free estimate as part of our roofing services. Learn all about the pros and cons of shingle roofs in our next article!