Kingspan Insulation
Kingspan Group

HPW™

HPW™ header

Kingspan GreenGuard® HPW™ Building Wrap is a non-woven, non-perforated building wrap. Its breathable polyolefin coating performs as both a water-resistive barrier and as an air barrier. HPW™ provides superior resistance against the rain before the siding goes on and against water that seeps through the siding after installation. Stays UV-resistant up to 9 months and can be used in residential and commercial applications.

Product Data 
Property Test Method Value
General
Nominal Thickness
(in/ mils)
ASTM D 1777 0.016 / 16
Nominal Width (ft)
9 / 10
Weight (lbs./1000 ft.2) ASTM D 3776 19
Tensile Strength (MD/TD)1
(lbs/in)
ASTM D 5034 48 / 47
Trapezoid Tearing Strength (MD/TD)2
(lbs/in)
ASTM D 1117 21 / 23
Water Resistance (minutes) ASTM D 779 > 60
Water Penetration Resistance
(CM H20)
AATCC-127 >500
Water Vapor Permeance
(perm)
ASTM E 96
(Desiccant Method)
(Water Method)

43
38
Water Vapor Transmission Rate
(g/m²/24 hrs.)
ASTM E 96
(Desiccant Method)
(Water Method)

307
264
Air Permeance
(L/s/m²@75 Pa)
(cfm/ft²@1.57 psi)
ASTM E 2178
0.001
0.000
Fire & Smoke
Flame Spread2
Smoke Developed2
ASTM E 84 5 (Class A)
65
  1. Machine/Cross Direction.
  2. These numerical flame spread and smoke developed ratings are not intended to reflect hazards presented by this material under actual fire conditions. All applicable building codes must be followed.

For more information on specific building product recommendations and installation guidelines, contact your Kingspan Insulation LLC representative.