HydraShell Premium underlayment is among the safest, strongest and best-performing solutions on the market. It is both lighter and stronger than Type 15 or 30 felt and is easier to handle during installation. HydraShell Premium won’t buckle, warp or crack, and it is backed by a limited lifetime warranty.
Lay out horizontally on the eave, printed side up, with minimum 4” horizontal laps and 6” vertical laps.
Fasten with corrosive-resistant roofing nails with a minimum head diameter of 3/8 inches or plastic capped roofing nails with a minimum plastic cap diameter of 1 inch, according to pre-printed nail pattern.
Learn about our other sealant products featuring Marco’s tested-tough performance.