SKU: 48796340903

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

Sale price$48.10 Regular price$53.44
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Ships within 48 hours · Estimated delivery Jul 11 - Jul 16

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Description

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

Grip-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 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.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 48796340903

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4.1 ★★★★★
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megan budziak
Phoenix, US
★★★★★ 4
Super Duper Big
Size: L For Adult, Color: Pink (Cover Only), Size: L For Adult, Color: Pink (Cover Only)
Wowww! I read the reviews about how big it was and looked at the images people posted but that doesn’t do it justice .. this thing is HUGE. I almost wish it was a lil smaller for real..but it’s really comfy , the kid loves it , she uses it as a landing for jumping . Helped clean up so many of her stuffed animals and random extra blankets .. and there’s still so much room left. The only downside is the zipper is of really low quality, you gotta be really careful putting stuff in there cause the opening isn’t that big .
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 24, 2026
A
Verified Purchase
amanda
Houston, US
★★★★★ 5
Huge for adult sized
Size: L For Adult, Color: Rainbow (Cover Only)
wow is all I can say I should have gotten the child sized one because this one is HUGE ! my daughter loves it but it does take up a lot of room
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Reviewed in the United States on May 26, 2026
K
Verified Purchase
Kerry
Louisville, US
★★★★★ 3
Fluffy and comfy
Size: L For Adult, Color: Pink (Cover Only)
Massive bean bag cover so it'll take a lot of stuffing to fill it. My daughter loves it so far.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 30, 2026
H
Verified Purchase
Heather
San Leandro, US
★★★★★ 5
Lifesaver!
Size: S For Kid, Color: Rainbow (Cover Only)
So far so good. I have two cute storage things I use to store my 5 year old’s stuffed animals in, but my daughter still had quite a few left and most of them are big. I found this bean bag stuffed storage cover and my daughter loved the rainbow colored one so I ordered it. It actually fits all of the remaining stuffed animals in it (mostly big ones) and looks like a normal bean bag. It’s cute and was a perfect solution for her huge stuffed animal collection.
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Reviewed in the United States on May 30, 2026
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Rusty Shakleford
Chelsea, US
★★★★★ 5
This is a fabulous LIGHTWEIGHT blanket exactly as advertised!
This blanket is exactly as described, it is LIGHTWEIGHT meaning it is thinner and cooler than some of the other Berkshire lines of thicker heavier blankets. I have purchased at least 20 Berkshire blankets/throws for myself and for gifts because they are the absolute best quality at a seriously reasonable price. They are so soft and comfy and they will survive years of regular use and washing. This one is a gorgeous deep purple and is the perfect weight for our recent 85+ degree days in March with nights that still need more than a sheet but less than a comforter. It measures true to size after a thorough wash/dry cycle and I have had zero shedding issues so I’m not sure what other buyers are doing but please wash your blankets before using them. The photos show this gorgeous purple in a twin size next to a twin “Ombré Burgundy classic heavyweight” (omg go check that one out) and you can see the purple one is just about half the thickness of the other one which is exactly what I wanted for the hotter summer months coming up. If you want a thicker blanket, Berkshire makes a lot of them, just look for the ones marked “HEAVYWEIGHT” instead of going through the hassle of returning a blanket that is clearly advertised as a “lightweight soft fuzzy plush blanket or throw” and then getting mad because you got a lightweight soft fuzzy plush blanket or throw 🤣
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 16, 2026

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