Hydrashell 50


Heavy-Duty Synthetic Roof Underlayment

The high-strength underlayment choice, backed by a limited lifetime warranty.

  • 10 times lighter per square than #30 felt
  • 20 times stronger than felt
  • 180-day UV resistance
  • High-strength woven fabric, polypropylene-coated on both sides
  • Specially formulated anti-slip walking surface
  • Printed nail locations and 3” overlap line
  • 100% asphalt-free
  • Made in the USA
  • Miami-Dade County Code approved
  • ICC-ES ESR-3361

Download Brochure   Call for Info

You May Also Need



Our extra heavy-duty HydraShell™50 is the most slip-resistant underlayment in the industry, and it comes with an unbeatable limited lifetime warranty. Stronger, lighter and safer than conventional felt roofing paper, HyrdraShell50 is made with Marco-quality, high-strength woven fabric that is polypropylene coated on both sides. Its specially formulated anti-slip walking surface is 100% asphalt free, offering a safer alternative to conventional roof underlayments. 10 times lighter per square and 20 times stronger than #30 asphalt felt paper, HydraShell50 is also UV-resistant and can be exposed for up to six months.


Weight Per Square: 2.8 lbs
Width/Roll Length: 48”/250’
Fire Rating: UL Class A
Nail Seal Ability: Pass
Water Transmission: Pass
Tear Strength: 58 lbs MD/77 lbs CD
Pliability: Pass
Water Ponding: Pass
Coefficient of Friction
     Static: Printed Side 1.202
     Kinetic: Printed Side 1.053

Download Info Sheet  

Watch Installation Video   Installation Question?

Easy, One Person Installation

HyrdraShell50 is lighter than felt so its easier to handle. It comes 10 squares to a roll, offering more coverage per roll, and is pre-printed with a nailing pattern for easier installation.

Step 1:

Lay out horizontally on the eave, printed side up, with 3” horizontal laps and 6” vertical laps.

Step 2:

Fasten with 1” diameter plastic cap roofing nails or staples according to pre-printed nail pattern.