VB Shield is 25 times stronger and more durable than the leading 15-pound felt.

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VB Shield is 25 times stronger and more durable than the leading 15-pound felt. Its superior lay-flat properties and water resistance keep it from warping, winkling, and cracking in cold weather, while its enhanced UV protection reduces heat buildup on hot days. It’s also 100% inorganic, so it will not rot or mold.

With less weight per roll, VB Shield is easier to handle during all stages of installation, while remaining strong enough to resist tearing and stretching in high-traffic areas and during high winds. VB Synthetics’ proprietary SlipGuard skid-resistant surface offers dynamic steep-slope traction, ensuring the best walking surface available. Plus, VB Shield is environmentally responsible and may contribute to your LEED and RGBP ratings.


PROPERTY ASTM Min. Average roll value Tolerance
Color Grey-White
Roll Width (in.) 48″ -0/+1/4”
Roll Length (ft.) 250
Total fabric weight (gsm) 110.50 +/- 5
Scrim (Weave Count) 9×7
MD Grab Strength ASTM D751 120 LBS 110 LBS MIN
CD Grab Strength ASTM D751 110 LBS 85 LBS MIN.
MD Trapezoidal Tear ASTM D2261 22 LBS 20 LBS MIN.
CD Trapezoidal Tear ASTMD 2261 19 LBS 18 LBS MIN
Elongation (MD/CD) % ASTM D751 19/18 15 MIN
Sandwich coating (gsm) 18
Antislip coating (gsm) 20
C O F ASTMD1894 0.45 0.3 MIN


48” X 250’ (1.22m X 76.20m)


  • ATSM D 226, Type II
  • Standard Specification for Asphalt Saturated Organic Felt
  • Used in roofing and waterproofing
  • ICC-ES AC 207
  • Acceptance Criteria for Polypropylene Underlayments
  • CSA A 123.3
  • Acceptance Saturated Organic Roofing Felt
  • ASTM E 108/UL 790 – Class A
  • Standard Test Methods for Fire Tests of Roof Coverings
  • CSA 220.1


Performance-grade synthetic roofing underlayment for use under:

  • Asphalt glass fiber mat shingle
  • Organic felt shingle
  • Metal (standing seam)
  • Tile
  • Slate
  • Approved for both vented and non-vented roof applications


A 50-year limited warranty applies to All VB Synthetic underlayments. Please contact VB Synthetics or visit vbsynthetic.com for details. No warranty, express or implied, is given as to the merchantability and fitness for a particular purpose, or otherwise for applications outside the scope of the installation guidelines.

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