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GAF RUBEROID HW 25 SBS Modified Bitumen Membrane, Smooth Surface, 39.375 in. x 49.2 ft. Roll
Regular price $109.00Orders start at $399 — combine any items to reach the minimum. Learn more
GAF RUBEROID HW 25 SBS Modified Bitumen Membrane, Smooth Surface, 39.375 in. x 49.2 ft. Roll
GAF RUBEROID HW 25 Smooth is an SBS-modified bitumen membrane made from a non-woven glass mat coated with flexible, polymer-modified asphalt. Each roll measures 39.375 in. x 49.2 ft. with a smooth surface finish. It pairs with compatible BUR and modified bitumen system components for commercial low-slope roof assemblies.
Key Features:
- Fiberglass reinforcement: A strong, resilient non-woven glass mat is coated with flexible, polymer-modified asphalt for added strength.
- SBS flexibility: Combines the strength of fiberglass reinforcement with the elongation characteristics of SBS-modified asphalt.
- Lightweight design: Installed roof designs weigh less than two pounds per square foot.
- Smooth surface: Available as a smooth surface for membrane applications.
- Backed by GAF: RUBEROID HW 25 Smooth is backed by GAF, a company with over 130 years in the roofing business.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | GAF |
| Sell unit | 1 roll, 39.375 in. x 49.2 ft. |
| Product line | RUBEROID HW 25 |
| Material | SBS-modified asphalt on non-woven glass mat |
| Color / finish | Black |
| Dimensions | 39.375 in. x 49.2 ft. |
| Surface | Smooth |
| Weight (installed) | Less than 2 lb per sq ft |
| Category | Commercial Roofing/Membranes/BUR & MB Systems |
| Intended use | Modified bitumen membrane for low-slope commercial roofing |
Coverage & How Much You Need:
One roll measures 39.375 in. x 49.2 ft., covering roughly one roofing square of membrane area per roll. Plan roll counts by measuring roof area and allowing for laps per the specified system details.
Fit and Compatibility:
RUBEROID HW 25 Smooth is part of GAF's commercial BUR and modified bitumen membrane systems. Use with compatible GAF substrates, adhesives and system components per the roof specification.
Frequently Asked Questions (FAQ):
Q: What is included with one order?
A: One roll of RUBEROID HW 25 Smooth membrane measuring 39.375 in. x 49.2 ft. in black.
Q: How much area does a roll cover?
A: A roll is 39.375 in. wide by 49.2 ft. long, so calculate coverage by roof area and deduct for laps required by the system specification.
Q: What is the membrane made of?
A: A non-woven glass mat coated with flexible, polymer-modified asphalt combining fiberglass strength with SBS elongation characteristics.
Q: How heavy is the installed system?
A: Installed roof designs using this membrane weigh less than two pounds per square foot.
Q: What surface finish does it have?
A: It is supplied with a smooth surface.
Q: Can it be used on my flat roof?
A: It is intended for commercial low-slope BUR and modified bitumen roof assemblies; confirm the assembly with the roof specification.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
RUBEROID HW 25 Smooth suits commercial low-slope assemblies where a lightweight, fiberglass-reinforced SBS membrane is specified. Verify substrate condition and lap requirements before ordering, and match the membrane with the system's specified adhesives or asphalt. Its smooth surface keeps installed weight under two pounds per square foot, which can matter on older decks.
Modified bitumen roofing work involves hot or chemical adhesive processes and rooftop fall hazards; follow the manufacturer's application instructions and OSHA fall-protection requirements.
Order GAF RUBEROID HW 25 Smooth membrane rolls for your next modified bitumen roof today.
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