HydraShell Max

HydraShell MAX

High Temperature Ice And Water Protection

The reliable underlayment choice with a 30-year limited warranty.

  • Won’t wrinkle or absorb water
  • Stays flexible in cold weather
  • 25 times stronger than #15 felt
  • 12 times stronger than #30 felt
  • More coverage per roll
  • Less weight per roll
  • Requires fewer fasteners
  • Cool Gray surface to reduce heat build-up
  • 90-day UV exposure rating
  • Class A fire rating
  • Use under asphalt shingles, synthetic shingles, cedar shakes, and metal
  • Miami-Dade County Code approved
  • Made in the USA

Download Brochure   Call for Info

You May Also Need

HydraShell Max


When you need a high-strength, lightweight synthetic roof underlayment, HydraShell™ MAX is the choice for you. Manufactured from 100% synthetic materials, HydraShell MAX has a four-layer construction making it 25 times stronger than #15 felt and 12 times stronger than #30 felt. It requires significantly few fasteners, and provides a tough, durable deck cover. Less weight per roll and a non-woven walking surface makes for a simple and easy installation. Backed by a 30 year limited warranty, HydraShell MAX is designed for use under all types of roofing materials including asphalt shingles, synthetic shingles, cedar shakes, and metal.


Roll Dimensions: 40”/300’
Permeability: 0.1 perms
Water Transmission: Pass
Tear Strength: 33 lbs MD/24 lbs CD
Tensile Strength: 95 lbs MD/85 lbs CD
Burst Strength: 160 psi
Elongation: 20%
Weight Per Square: 1.96 lbs
Nominal Thickness: 6.2 mils
Temp. Range (Internal): -70° F to 240° F

Download Info Sheet  

Watch Installation Video   Installation Question?

Easy, One Person Installation

HyrdraShell MAX is lighter than felt so its easier to handle. It offers 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.