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Roofing Underlayment


Polyshield® RadWrap® Synthetic Roofing Underlayment


Polyshield® RadWrap® synthetic woven roofing underlayment provides enhanced water-resistance and protection from the elements. RadWrap© underlayment is made from long-lasting polymers, which provide added strength and longevity. This type of underlayment is typically moisture-resistant, and, when it’s installed correctly, it offers better protection from the weather compared to felt.

Many roofers are choosing to go the route of synthetic roofing underlayment. There are five main advantages to installing RadWrap© synthetic roof underlayment. Compared to felt, RadWrap© synthetic roofing underlayment is:

  • Tough
  • Fast to install
  • Safe
  • Repels water
  • Incorporates Radiant Barrier technology


RadWrap© synthetic underlayment has a tough and durable construction with an extremely high tear strength compared to felt.

RadWrap© synthetic roof underlayment is extremely durable. It typically doesn’t tear and is suitable for extended UV and moisture exposure in some cases, which is especially helpful if there’s a bit of lead time before your roof covering is installed.

RadWrap© synthetic underlayment also stands up to boot traffic, which is important when your roofing contractor is walking around on its surface as it’s being installed. We call this “use after abuse” — the product can still perform as designed even after the abuse it takes during installation.

RadWrap© synthetic roofing underlayment also tends to be lighter – up to four times lighter in some cases


Because there is more material per roll compared to felt (as RadWrap© synthetic roofing underlayment comes in wider and longer rolls, from 48″- to 96″-wide), it results in fewer trips up the ladder for your roofers, saving them time and perhaps helping the job move along faster. For instance, a typical 2500 square-foot home might require three rolls of synthetic underlayment compared to 14 rolls of No.30 felt to cover the same area.


RadWrap© synthetic underlayment is also advantageous for worker safety — the surface of RadWrap© synthetic roofing underlayment features a more slip-resistant surface for enhanced walkability.


Where felt products tend to absorb water, RadWrap© synthetic roofing underlayment is built to repel water. This is important for homeowners concerned about moisture infiltration, especially if they plan to leave the underlayment exposed for a prolonged period of time. Additionally, because it’s made of plastic, RadWrap© synthetic underlayment is typically resistant to mold growth, a definite advantage over felt.


RadWrap© incorporates 95% reflectivity to one side of the underlayment. This feature may help to meet building code requirements (like Title 24 in California) while enhancing the building’s thermal resistance.