5 Roy Court
Wantage, NJ 07461
Tel (973) 702-8200
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(973) 948-0025
Fax (973) 702-8207

NJ License #13VH00092600

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Roofing underlayment was originally used for temporary protection against the elements but is now an integral part of a home's overall roof system. Underlayment provides a vital second layer of protection on top of the sheathing to help keep moisture out. It is necessary for roofing manufacturers' warranties and is now considered a necessary piece of the roofing puzzle. State and municipal codes require roofing underlayment for the system to meet standards like fire resistance, wind uplift resistance, puncture resistance, and resistance to wind-driven rain.

The choice of one underlayment over another depends on a number of conditions, including its application, whether it will be used on a steep or low-slope roof, the fire code requirements in place, and in what region the structure is located. Fortunately, for consumers and roofing contractors, there are many underlayment manufacturers on the market. Underlayments fall under three basic categories: felts, synthetics, and self-adhering ice-and-water barriers. (See National Roofing Contractors Association article, “Getting on Top of Underlayments” by James Munro, technical writer for NRCA. He holds a master's degree in managerial communications from Northwestern University.)

Asphalt-Saturated Felt

Asphalt-Saturated Felt Underlayment Also called builder's felt or felt paper, asphalt-saturated felt has been covering roofs for more than 50 years. The felt is made of a paper base that is impregnated or saturated with asphalt to make it more resistant to the elements. Some papers are actually coated in asphalt, while others are truly saturated. Roofing paper or felt is rolled across a roof deck and stapled or nailed in place. Builder's felt differs by weight and may be No. 30 or No. 15 felt, a reference to the original weights of each underlayment. "The name changed because today's 15 lb. felt is actually lighter than it used to be, because of modern technology and production," says Joan Crowe, technical manager of the National Roofing Contractors Association in Illinois. Although inexpensive and easy to install, felt paper can be susceptible to tearing, especially in hot temperatures, and makes for a slippery surface to walk on while installing the roof covering. Asphalt felt also tends to trap moisture within the roofing system since it does not breathe.

Synthetic Underlayment

Synthetic Underlayment New on the market are the polypropylene underlayments that are getting raves in the roofing world. Made of synthetic polymers, the exact composition of these underlayments varies from manufacturer-to-manufacturer and remains strictly proprietary. These synthetic underlayments are marketed as wrinkle-free, tear resistant, and safer for workers to walk on during installation. It’s believed that synthetic underlayments are generally more durable than asphalt-saturated felt but also more expensive.

High-Performance Roofing & Self-Adhesive Ice & Water Barrier Underlayment

High-Performance Roofing & Self-Adhesive Ice & Water Barrier Underlayment Roof TopGuard II and Roof AquaGuard HT have the newest technology in high-performance roofing underlayment. They are recommended for use in place of standard underlayment such as 15- and 30-pound felt. Its 5-layer polypropylene/polyethylene construction results in high strength, maintaining low weight (43 pounds per roll) making it suitable for use under all roofing materials.

GAF WeatherWatch™

GAF WeatherWatch underlayment

Granular Surface Leak Barrier for Residential Use

  • Helps Eliminate Waste – Special adhesive allows for one-time repositioning, but aggressively adheres over time
  • Safer Installation... SlipGuard™ granular surface improves footing
  • Dependable – Self-seals around nails
  • Saves Labor – Split-back release film peels off in layers for faster installation—allowing you to offer greater homeowner value
  • Looks Better – Fiberglass reinforcement helps resist wrinkling and buckling–lays flatter under shingles
  • Convenient – 1.5 and 2.0 square roll sizes – your choice
  • Peace of Mind – Benefits from the same warranty term as the asphalt shingle it is applied under, up to a maximum of 30 years
  • Recognized Quality with UL Listed Accessory, ICBO ES Listed (see ICBO ES ER-5433), and SBCCI PST & ESI Listed (Report No. 2104)

Rosselli Roofing & Siding specialize in difficult assignments, frequently using extraordinary materials and demanding techniques. So, if you're looking for something unique or just a project done correctly, you've come to the right professionals to do the jobWe've Got You Covered!

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