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Metal Roofing and Siding Accessories




  • The most slip resistant underlay in the industry
  • 25X stronger than #15 felt – won’t tear off or buckle when wet
  • 2.5X lighter per square than
    #15 felt
  • UV resistant – can be exposed
    for up to 6 months
  • Class A fire resistant
  • Pre-printed nailing pattern
    speeds installation
  • 25 year warranty


Discover a new underlay that is stronger, lighter and safer than conventional felt roofing paper.

HyrdraShell25 is a synthetic underlay constructed of high strength woven fabric that is polypropylene coated on both sides.

A specially formulated anti-slip walking surface is 100% asphalt free, offering a safer alternative to conventional roof underlay.

HyrdraShell25 is 2.5 times lighter per square and 25 times stronger than #15 asphalt felt paper, and comes 10 squares to a roll, offering more coverage per roll. HyrdraShell25 is UV-resistant and can be exposed for up to six months. Its pre-printed nailing pattern provides ease of installation.