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G.A.P. WaterGuard™️ All-Purpose Synthetic Underlayment

Brand: G.A.P. Roofing, Inc

G.A.P. WaterGuard™️ All-Purpose Synthetic Roofing Underlayment is a polypropylene, two-side coated woven fabric containing a patented slip resistant surface (U.S. Patent # 7745353).

This product is used as a secondary roofing protection, mechanically attached to the roof sheathing under the primary roofing material.

Polypropylene woven scrim (UV stabilized), 1.2 mil/1.0 mil average coating weight (beige top/grey bottom), total weight 3.6 oz./yd2 (122 g/m2) +/- 5%, and an overall thickness of 8 mil (ASTM D1777). 

Rolls have a 2” core, 48” (width) x 250’ (length) and weigh approximately 25 lb. per roll.

Specifications

Rolls Per Pallet

  • 42

Pallets Per Truck

  • 38

Weight

  • 25 lbs

Size

  • 48” x 250'

Thickness

  • 8 mils

Coverage

  • 1000 SF

Mullen Burst (ASTM D-3786-01)

  • 215 psi (1481 kPa)

Slip Resistance (ASTM 1679)

  • > 1 (Tribometer)

Grab Tensile (ASTM D-5034-09)

  • MD 140 lb (620 N) / CD 125 lb (555 N)

Strip Tensile (ASTM D-5035-11) – N/5cm

  • MD 90 lb (800 N) / CD 125 lb (701 N)

Tensile Elongation (ASTM D-5035-11)

  • MD 24 % / CD 21 %

Tongue Tear (ASTM D-2261.07a)

  • MD 35 lb (155 N) / CD 35 lb (155 N)

Trapezoidal Tear (ASTM 4533-04)

  • MD 40 lb (177 N) / CD 30 lb (133 N)

Moisture Vapor Transmission (ASTM E-96-00)

  • 0.04 perms (0.30 g/day-m2)

Pliability (ASTM D-146-04)

  • Pass (no cracking)

Water Ponding (CAN/CSA A220.1)

  • Pass (no dripping)

Low Temperature Flexibility (ASTM D-1970-01)

  • Pass (no cracking, 5ᴼ F / -15ᴼ C)

Operating Temperature Rating

  • -40ᴼ F (-40ᴼ C) to 240ᴼ F (115ᴼ C)

Puncture (T 803)

  • 4.7 joules

UV Weathering

  • 80 % of strength after 6 months (UV Stabilized)

Class A Fire Rating (ASTM E-108.2007)

  • Pass

Florida Building Code Approved

  • FL 6645

ICC-ES Acceptance for Roof Underlayment

  • (AC 188) ESR-2185

Hail Resistance Rating (UL 2218)

  • Pass

Impact Resistance (ASTM D-1709)

  • Pass

Roofing Underlayments (ASTM D-226)

  • Pass
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