Hydrashell Underlayment

HydraShell™ is a synthetic underlayment constructed of high-strength woven fabric that is polypropylene coated on both sides. Its specially formulated anti-slip walking surface is 100% asphalt free and is up to 10 times lighter and 20 times stronger than 30# asphalt felt paper. Pre-printed nail and staple patterns, as well as overlap lines make installation faster than ever. Hydrashell™ is rated for 180 days of exposure. 

Made in the USA