Roofing Component Basics


Roofing terminology can be a bit overwhelming. These basic roofing definitions will help get your project off on the right foot.

There’s a lot to cover when it comes to learning about what types of materials go into roofing a house. Some of it involves some pretty tricky terminology. Here are a few definitions that cover the basics.

The major function of a roof is really to protect the home from the elements — snow, rain, wind, etc. And this is why you need a roof that really performs, and how it performs depends upon how well it keeps out the elements.

The type of roof you have will determine how easily water — or the other elements — are diverted. But before we get into the types of roofs, we need to know the different components that make up a roof.

We are your Evanston roofers, along with many other areas, and we want you to feel educated in roofing terminology before you begin your next roofing project. We understand that the roofing industry terminology can get a bit confusing, so we want to show you the basics so you can feel confident and knowledgeable during our time together. 

Roof Components

Underlayment — The underlayment of a roof is the black paper that’s laid over the plywood sheeting in order to seal the roof from damaging elements (snow, rain, ice, etc.). The use of a membrane is typically required, a waterproof membrane, a sweat sheet or vapor barrier — with the underlayment paper serving the triple function.

Flashing — Flashing on a roof refers to the metal pieces that are used to divert water from places where it might collect, such as hips and valleys. Flashing can be made from a variety of materials. You can use a galvanized flashing, a galvanized alloy, copper, lead coated copper or stainless steel. Each of these would work fine.

Shingles or Tile — The shingles or tiles make up the outermost part of the roof. Sitting atop the underlayment, they form the outermost barrier against the elements.

In residential roofing the same basic types of roof have been in sue for hundreds of years are still in use today. The shingle — or tile — has been in use for thousands of years, in fact. You can find intact tiles that have been in use 5,000 years.

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