DESCRIPTION. ALCO Shield™ GRANULAR+ Ice and Water Protector is designed for use as a shingle underlayment in critical areas of the roof, such as eaves, valleys, ridges, dormers and skylights. ALCO Shield GRANULAR+protects roof structures and the interior from water penetration caused by ice dams and wind driven rains.
Is ice and water shield the same as underlayment?
Synthetic underlayment, like an ice and water shield, is quite a bit lighter, rolls out in large rolls, and is made of polypropylene, fiberglass, polyethylene, and polyester. ... While they don't seal the nails as ice and water shield does it is a superior underlayment when compared to traditional felt paperfelt paperCommon grades include 10-, 20-, 30-, and 60-minute. The higher the rating, the heavier and more moisture-resistant the paper. A typical 20-minute paper will weigh about 3.3 lbs per square, a 30-minute paper 3.75, and a 60-minute paper about 6.https://en.wikipedia.org › wiki › Tar_paperTar paper - Wikipedia.Jan 31, 2020
Can you use ice and water shield on the entire roof?
You may apply an ice and water protector on your entire roof, but this can also be costly overall. Instead, install it first on critical areas of your roof before you consider covering the whole roof. Install your ice and water protector covering at least 3 feet from the edge of your roof.