HydraShell SUPREME

High-Performance Synthetic Roof Underlayment

The superior synthetic underlayment choice with a limited lifetime warranty.

  • Superior lay-flat properties: won’t wrinkle or absorb water
  • Stays flexible in cold weather
  • 20 times stronger than #30 felt
  • Less weight per roll
  • Low-slip bottom coating
  • Cool Gray surface to reduce heat build-up
  • 90-day UV exposure rating
  • Class A fire rating
  • Use on steeper slopes under asphalt shingles, synthetic shingles, cedar shakes, and metal
  • Miami-Dade County Code approved
  • Made in the USA

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HydraShell Supreme


HydraShell™ SUPREME is a 100% premium synthetic underlayment that is easy to install, lightweight, and offers a low-slip bottom coating. The unique four-layer construction makes it 20 times stronger than #30 felt. Each 10 square roll weighs less then 26lbs. and is attached with standard roof nails, making the installation simple, less expensive, and fast.

HydraShell SUPREME has a non-woven walking surface and a specially formulated, low-slip, bottom-side coating offering a safer installation process. Backed by a limited lifetime warranty, it is designed for use on steeper slopes under all types of roofing materials including asphalt shingles, synthetic shingles, cedar shakes, and metal.


Roll Dimensions: 40”/300’
Permeability (ASTM E96): 0.1 perms
Water Transmission (ASTM D4869): Pass
Tear Strength (ASTM D4533): 38 lbs MD/37 lbs CD
Tensile Strength (ASTM D751): 120 lbs MD/115 lbs CD
Burst Strength (ASTM D751): 160 psi
Elongation (ASTM D751): 20%
Weight Per Square (ASTM D5261): 2.46 lbs
Nominal Thickness (ASTM D1777): 7.5 mils
Temp. Range (Internal): -70° F to 240° F

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Easy Installation

HyrdraShell SUPREME 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.