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What is Shingle Underlayment and Why Do I Need It?

The primary purpose of the shingle underlayment is to provide an additional moisture-resistant layer under your roof shingles. Though pricier than other options, synthetic underlayments are lighter in weight, better at lying flat, and offer superior water resistance compared to other options.

In a modern roof system, a professional contractor will actually install two different underlayments to maximize protection from the elements. The first underlayment is a waterproof ice and water membrane that is installed along the perimeter of the roof to protect a roof from ice damming and water damage.

Certainteed’s WinterGuard goes above and beyond, protecting valleys, flashing, and eaves that may be more susceptible to water damage.

The second underlayment is a tear and water-resistant material that covers the remaining areas of the roof deck and also provides a high traction walking surface that increases safety for the contractors installing the roof.

Certainteed’s RoofRunner outperforms felt and other synthetics during installation and throughout the life of your roof.

What is Shingle Underlayment

Installing both layers serves to provide the maximum protection possible for a new roof. This is why we always recommend installing a dual underlayment system. Not only will the roof last longer, but also offer a higher level of protection from the elements.

Our over 75 years of roofing experience has led us to continue to stay up-to-date on the latest techniques and newest technologies in the roofing industry. You can find out more about shingle underlayments and CertainTeed’s Integrity Roof System, here. And if it’s time to upgrade your roof, don’t hesitate to contact us for a free estimate.