Fortifiber 500 sq. ft. AQUABAR "B" Tile Underlayment Roll-70-195 - The Home Depot
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Model # 70-195

Internet # 202592567

Store SKU # 495804

500 sq. ft. AQUABAR "B" Tile Underlayment Roll

Fortifiber 500 sq. ft. AQUABAR

This item has been discontinued.
The Home Depot no longer carries this specific product.

$0.04 / sq. ft.
$21.97/  roll  (covers 500.0 sq. ft.)


Model # 70-195

Internet # 202592567

Store SKU # 495804

Store SO SKU # 1000894560

Aquabar "B" floor and tile underlayment is an extremely effective moisture vapor retarder for use in a variety of interior construction applications. Consisting of two layers of Kraft paper laminated with asphalt, Aquabar "B" is a non-reinforced 30/30/30 duplex type Grade "B" paper. In the battle against interior moisture damage, the best defense is a strong offense. When you block moisture vapor from creeping underneath finish materials or reaching moisture sensitive substrates, you help increase the useful life and appearance of finish surfaces. To help win the battle, the Fortifiber Building Systems Group offers Aquabar "B" as inexpensive insurance to reduce moisture-related problems.

  • Ideal underlayment for wood flooring and tile
  • Consisting of two layers of Kraft paper laminated with asphalt, Aquabar "B" is a non-reinforced 30/30/30 duplex type Grade "B" paper
  • 500 sq. ft. roll measuring 3 ft. by 167 ft.
  • An extremely effective moisture vapor retarder for use in a variety of interior construction applications
  • Note: Product may vary by store.

Info & Guides

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Assembled Depth (in.) 
2004.000 in 
Assembled Height (in.) 
0.063 in 
Assembled Width (in.) 
36 in 
Product thickness (mil) 
Recommended overlap (in.) 
Roll length (ft.) 
Roll width (in.) 
Commercial / Residential 
Commercial / Residential 
Flooring Product Type 
Flooring type(s) used with 
Moisture control included 
Package coverage (sq. ft.) 
Sound absorbing 
Subflooring type 
Warranty / Certifications
Manufacturer Warranty 
To be free from manufacturing defects 


Rated 4.9 out of 5 by 32 reviewers.
Rated 5.0 out of 5.0 by National Wood Flooring Association Approved Vapor Retarder This product is great in that it provides the necessary vapor protection when installing wood floors in rooms over unfinished spaces (in my case, the living room over the basement). It is an product approved by the NWFA as a underlayment for wood and tile. This is a much cleaner product to user over asphalt / felt paper, as the asphalt material is sandwiched in between to layers of kraft paper. In addition, rosin paper and felt paper are no longer recommended underlayments. A penny more per square foot compared to rosin paper. Product was shipped faster than the estimated delivery. Installation is a breeze, especially with the markings showing your where to overlap adjacent sheets (min 4"). No need to attach the paper to the subfloor, as it will be held in place with the nails or staples holding down the wood floor. I just did one line of staples near the middle to hold the paper in place. October 9, 2013
Rated 5.0 out of 5.0 by Aquabar Underlayment Not much to say! Much better than the plastic rolls sold in their store at a much better price. You can easily drop a chalk line on this. Unable to accomplish that on the plastic sold at the stores. Not sure why they don,t carry it in stores(?). May 13, 2015
Rated 5.0 out of 5.0 by Great product! This vapor paper is great. Very easy to install. Does have a very strong tar smell to it so open a window to disperse the fumes. April 26, 2015
Rated 5.0 out of 5.0 by Works well I have used both felt and Aquabar B for flooring installation. I liked working with the Aquabar B better. It was cleaner, and easier to use. April 14, 2015
Rated 4.0 out of 5.0 by Works great for a vapor barrier in showers This is what I use for waterproofing my showers. I like this product better than the roofing paper because it is thinner and creases better in corners or recessed shampoo niches. January 2, 2015
Rated 5.0 out of 5.0 by great underlayment Perfect underlayment for wood flooring over a finished lower lever. Strong yet easy to work with. Better than smelly, sticky and too thick roofing felt or too thin rosin paper. Should be a staple at the store yet had to order though it arrived quickly. Thanks HD! January 21, 2014
Rated 5.0 out of 5.0 by aquabar "B" at great price and free,fast shipping. Can't beat it. I was unsure if this was the right product since the information presented on it was very sketchy at best. I'm putting it on 3/4 T&G under hardwood as a vapor barrier. It says just "aquabar" not aquabar "B" so I was not 100% sure it was what I thought it was. The picture is as non-descript as you can get and tells you little. Also it says "Roberts" and I knew fortifiber made the stuff I wanted. However since I figured this was a trademark name and they appeared to only make one kind I took a chance - plus I could take it back to the store anyway so I had nothing to lose with free shipping. Product arrived in 2 days and it was what I expected - Fortifiber Aquabar "B". Very good for free shipping. Everyone else wanted a good deal to ship this stuff due to the weight and none of my local stores had it at all. Really glad I went this way after looking all over for it. Saved me some time AND money. October 29, 2011
Rated 4.0 out of 5.0 by So far this product does what it states it will I used this as an underlayment for my hard wood floor project. Simple to install and works better than rosen paper December 17, 2013
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