Understanding The Purpose of The Roof Underlayment

By Stacy Mellete

When replacing your roof, the underlayment is one of the first things we install. It is an important part of a residential roofing system because the underlayment covers the roof deck.
The underlayment’s main purpose is to protect your roof deck from all sorts of damage, so it’s important to invest in a high-quality underlayment when replacing your roof in Riverview FL. Learn more about the underlayment here:

Understanding The Purpose of The Roof Underlayment

The Purpose of the Underlayment

The underlayment provides a layer of separation between the roof sheathing and the shingles, and creates a moisture barrier. Roof coverings like asphalt shingles act as your roof’s primary defense against roof leaks. The underlayment acts as the secondary barrier.
In addition, while newer homes use plywood or oriented strand board for roof sheathing, old homes used fir and pine boards. The resin pockets in these old boards can react chemically with some roof covering materials, so the underlayment prevents this.

The underlayment also acts as temporary protection during roof installation in Riverview FL. While most roof installations are completed quickly, there is usually a little time when the underlayment is the only thing protecting the roof.

The underlayment performs this job adequately because all manufacturers design their underlayment to prevent the passage of moisture in its liquid form. As residential and commercial roofing expert in Riverview Florida, we use only the best quality underlayment for our customers.

GAF Deck-Armor™

We are a certified GAF contractor and this allows us to offer and install the complete GAF Lifetime Roofing System. One of the essential components of this system is its high-quality underlayment. Deck-Armor is exceptionally strong, and it features revolutionary breathable technology.
It helps prevent moisture from being trapped within your roof, while still preventing roof leaks. It also lies flatter once installed, so your shingles will look flat and uniform after roof replacement.

You can rely on Affordable Roofing Systems for all of your roof repairs in Riverview Florida and replacement because of our many years of experience and top industry certifications. We are one of the few GAF Master Elite® contractors in the country, allowing us to offer superior warranties and products from GAF.

We serve Tampa, St Petersburg and many other areas in FL. Call us at (813) 542-8462 to learn more about our services and products. You can also ask for a free estimate.

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Our Roofing Solutions

Your roof has an important job to do to keep your home dry, but it can also be an impressive home feature.


Our stone coated steel roofing system is available in a wide range of styles including Tile, Shake, Slate, and Shingle, and in a variety of colors. We’ll help you to choose one that will fit your home’s style and your budget.


As the most-used roofing type across North America, asphalt strikes a balance between price and durability, with a life expectancy of up to 20. Shingles are available for those who want affordable, genuine slate roofing.


Tile roofs offer unparalleled value when cost per year of use is factored in. While upfront costs are higher, customers who choose a clay or concrete tile roof will enjoy the aesthetics and quality for a lifetime.


Metal roofs today come in a wide array of colors and finishes. Innovations in metal roofing technology have significantly enhanced the performance of metal roofs.

TPO Membrane

TPO can be installed to any scale with some of the world’s largest building utilizing TPO roofing systems – it comes in strips typically 8ft 10ft and 12ft wide that are heat welded on site.

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