When it comes to protecting your home from the elements, the roofing material you see from the street (shingles, tile, or metal) is just one part of the system. Hidden beneath the surface is a critical component that doesn’t always get the attention it deserves: roof underlayment.
So, what is underlayment for a roof? Is it something Arizona homeowners really need? Let’s break it down.
Roof underlayment is a protective layer installed directly on top of your roof deck and underneath your primary roofing material. Its purpose is to act as a second line of defense against moisture, wind, and extreme weather. If rain or dust gets past the outer layer of your roof, the underlayment is there to keep it from reaching the wood decking—and ultimately, your home’s interior.
There are several types of underlayment for roofs, each with different benefits depending on your climate, roofing material, and budget.
Absolutely. Believe it or not - especially in Arizona! While it’s easy to assume that roof underlayment is only important in rainy or snowy climates, Arizona’s extreme heat and monsoon storms make it just as essential. Here's why:
Skipping the underlayment or choosing the wrong type can lead to premature roof failure, mold growth, and costly repairs down the line.
Even the best underlayment doesn’t last forever—especially under Arizona’s harsh sun. On average, the lifespan of roof underlayment depends on the material:
It’s also important to note that tile roofs in Arizona may outlast the underlayment beneath them. Many homeowners assume that if the tiles still look good, the roof is fine—but what’s underneath could be deteriorating. That’s why regular inspections and maintenance are key.
If your home is more than 15 years old and hasn’t had a recent roofing inspection, it may be time to check in on the condition of your underlayment—even if the roof looks fine from the outside.
Not all underlayment products are created equal. In Arizona’s unique climate, choosing the right material is key to long-term performance.
Here are the most common types of underlayment for roofs in Arizona, and when each one is most effective:
While still used today, this “traditional” underlayment is gradually being replaced by more advanced synthetic options due to its shorter lifespan.
Synthetic underlayment is a popular choice for its durability and ability to handle Arizona’s fluctuating temperatures. It also holds up better during installation, especially in windy or high-traffic areas.
This type of underlayment is often used as an additional layer in problem spots to boost protection where water is more likely to accumulate or infiltrate.
While your choice of shingles or tiles plays a big role in your roof’s appearance and performance, the underlayment is what keeps your roof structure protected long-term. And in Arizona’s unique mix of heat, dust, and storm activity, installing the right underlayment is more than just a smart choice—it’s a necessity.
At Paragon Contracting, we know how to build roofs that stand up to Arizona’s extreme climate. Whether you’re re-roofing your home or building from the ground up, our team will help you select the best underlayment for your roof based on your home’s design, roofing material, and budget.
Need a roof inspection or underlayment upgrade? Contact Paragon Contracting today for expert roofing services in Arizona that you can trust.