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home > Grip-Rite 36-in x 32.8-ft (300-sq ft) Fiberglass Base Sheet Roof Underlayment > Grip-Rite 36-in x 32.8-ft (300-sq ft) Fiberglass Base Sheet Roof Underlayment

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Grip-Rite 36-in x 32.8-ft (300-sq ft) Fiberglass Base Sheet Roof UnderlaymentGrip Rite Fiberglass Roof Underlayment, 36 in x 32. 8 ft A rugged fiberglass base sheet designed for flat roofing applications, this Grip Rite roll covers 300 sq ft and lays flat for fast installation. Ply lines and strong nail holding performance provide a reliable substrate for multi ply roofing systems. Key Features: Fiberglass Construction: Durable base sheet engineered for strength and nail holding ability Easy Install: Rolls out flat with

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Grip-Rite Fiberglass Roof Underlayment, 36-in x 32.8-ft

Name: Grip-Rite 36-in x 32.8-ft (300-sq ft) Fiberglass Base Sheet Roof Underlayment
Brand: randomsongs.org
SKU: 67096950411
Price: 53.44 USD
Availability: InStock
Rating: 4.0351 (1528 reviews)

A rugged fiberglass base sheet designed for flat roofing applications, this Grip-Rite roll covers 300 sq ft and lays flat for fast installation. Ply lines and strong nail-holding performance provide a reliable substrate for multi-ply roofing systems.

Key Features:

Fiberglass Construction: Durable base sheet engineered for strength and nail-holding ability
Easy Install: Rolls out flat with printed ply lines to speed alignment and fastening
Flat-Roof Ready: Designed for use with flat roofing; not for asphalt shingles, metal, or wood shakes
Generous Coverage: 36 in x 32.8 ft roll covers approximately 300 sq ft
Standards & Warranty: Meets ASTM 4601 Type 1; backed by a 1-year limited warranty

Specifications Table:

Specification	Details
Coverage Area	300 sq ft
Length	32.8 ft
Width	36 in
Material	Fiberglass
Application Method	Nail
For Use with Flat Roofing	Yes
For Use with Asphalt Shingles	No
For Use with Metal Roofing	No
For Use with Wood Shakes	No
Warranty	1-year limited
Standards	ASTM 4601 Type 1
UNSPSC	30151500

Frequently Asked Questions (FAQ):

Q: Can this underlayment be used under asphalt shingles?
A: No. It is intended for flat roofing applications and not for asphalt shingles.

Q: How much area does one roll cover?
A: Approximately 300 square feet per roll.

Q: What is the installation method?
A: Nailed installation; align using the printed ply lines and fasten per local codes.

Q: Is it suitable for metal or wood shake roofs?
A: No, it is not recommended for metal roofing or wood shakes.

Q: Does it meet any standards?
A: Yes, it meets ASTM 4601 Type 1 specifications.

A Sleek, Structured Foundation for Modern Flat Roofs

This fiberglass base sheet sets a clean, confident groundwork that refines the silhouette of a flat roof. I love the crisp ply lines—they guide an impeccably tailored installation, elevating the finish. Pair it with minimalist flashing and tonal gravel for a polished, architectural statement. It’s a quiet essential that underpins the luxury of a well-executed envelope.

Elevate your flat roof system with Grip-Rite’s fiberglass base sheet—order today for fast, reliable installation and lasting performance.