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What is Roofing Underlayment?

If you've lived in Maine for a few years or more then we don't have to tell you about all the harsh weather your roof will face throughout the year, not to mention all of the damage that a Portland Roofer will repair. One of the most crucial components to a roofing system is its underlayment, but what specifically is underlayment? The Roofing underlayment is a waterproof or water-resistant barrier that is applied on top of the plywood decking before shingles and other roofing materials are installed. The 3 main types of roofing underlayment are as follows:

  • Traditional Asphalt-Saturated Felt (Water-Resistant)
  • Non-Bitumen Synthetic Underlayment (Waterproof Ice & Water Shield)
  • Rubberized Asphalt Underlayment (Waterproof Ice & Water Shield)

Today, synthetic underlayment is the preferred choice for a Portland Roofing Contractor, and some geographic locations require its application per building codes. For added protection and peace of mind, this product can be installed on the entire roof but should be used at least in areas that are prone to ice damming and high winds, among others such as:

  • Valleys
  • Eaves
  • Chimneys
  • Skylights
  • Low Slope Roof Surfaces

The integrity of a roofing system is a vital part of home ownership and the overall value of your investment. Water that seeps under shingles and other roofing components can potentially cause a tremendous amount of damage to the roof, the attic, insulation, and the interior of your home. Keeping the area between your shingles and plywood decking dry is the best way to avoid such damage. A high-quality Ice & water shield underlayment is recommended.


Your choice of new roofing materials is an important decision when protecting your home from the elements, bringing out the beauty and extending the useful service life of your roof system. We are here to help advise you on what's best for your home and budget. Also serving South Portland, Scarborough, Cape Elizabeth, Gorham, and the surrounding areas.

Posted by: Admin
March 11, 2019
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