Model # 70-195

Internet # 202592567

Store SKU # 495804

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

$0.04 /sq. ft.
Covers 500.00 sq. ft.
$21.97 /roll
  • Helps increase the life and appearance of your flooring
  • Protects against moisture vapor
  • For use under tile and wood



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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Product Width (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 


Price: $20 - $30
Brand: Fortifiber
Review Rating: 4 & Up
Package coverage (sq. ft.): 500


Rated 4.8 out of 5 by 38 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 Better than felt paper cheaper than the fancy alternatives Recently installed solid hardwood floors in two bedrooms and used this as underlayment. Easy to work with, very clean and smooth so it was easy to move boards around while planking. Cheaper than a lot of the alternatives as well. Only issue I experienced was that chalk lines are harder to see and wipe off easier than standard felt paper. December 22, 2015
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 3.0 out of 5.0 by Good product at the beginning of the roll. Near the middle to end the paper gets ridges that do not lay flat. Good product at the beginning of the roll. Near the middle to end the paper gets ridges that do not lay flat. September 1, 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 Seems legit as moisture barrier Remodel. Was recommended for use under 5/8 bamboo tongue and grove flooring - not the glued kind but the nail/stapled kind. Wasn't sure it would help eliminate squeaks or that it was needed but it appears to barrier travel of moisture from crawl space. Not sure if it was / is needed but is easy to use. I screwed the subfloor to help control squeaks but could still get some noises sometimes some places. It had been nailed w/ ring nails. With the T&G floor stiffening the whole membrane and the "lubrication" of the barrier paper the squeaks are reduced if not eliminated. Might, of course, have been fine w/ out the paper, too. June 3, 2013
Rated 5.0 out of 5.0 by good product, will use and recommend again. This product is a must use for laying hard wood flooring- lighter and cleaner than tar paper, and in my opinion a better choice than red rosin paper. September 4, 2012
Rated 5.0 out of 5.0 by no problem! Recommended by the pros - I could have used red rosin paper, which is a stock item at HD, but this will slow down any moisture movement through the floor and (I hope) avoid problems in our new 3/4 in. oak site-finished floor. Easy to work with, no roof paper mess or smell, 2 rolls arrived at home in a few days UPS in good shape. I'm surprised it's not a stock item locally. August 27, 2013
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