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photo of HPR Glasfelt Asphalt-coated, inorganic fiberglass base sheets

HPR® Glasfelt/ Premium

Asphalt-saturated fiberglass felt used as the ply sheet in the construction, maintenance and waterproofing of high-performance built-up roofing systems.

Its natural porosity minimizes the negative effects of trapped moisture and blistering. The inorganic base sheet is rot proof and will not wick or absorb moisture, minimizing the risk of ply delamination and creating a stronger, more secure roof assembly.

Product Advantages

Technical Data

HPR Glasfelt HPR Premium Glasfelt
*Tensile Strength MD 44 lbf./in. (7.7 kN/m)
XD 44 lbf./in. (7.7 kN/m)
MD 60 lbf./in. (10.5 kN/m)
XD 60 lbf./in. (10.5 kN/m)
Width 3 ft. (0.91 m) 3 ft. (0.91 m)
Length 180 ft. (54.8 m) 180 ft. (54.8 m)
Weight 50 lbs. (22.67 kg) 60 lbs. (27.21 kg)
Nominal Thickness 20 mils (508 microns) 25 mils (635 microns)
Net Coverage 500 sq. ft./roll net (46.5 m2) 500 sq. ft./roll net (46.5 m2)

*Test Method ASTM D 5147 is tested at 2 in./min. @ 73.4 ± 3.6°F
(50 mm/min. @ 23 ± 2°C)


20 rolls/pallet (Both)

Approvals that apply to this product

FM Approved logo Miami-Dade County approved logo Intertek Warnock Hersey logo


Currently no certifications

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