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Custom Building Products

Model # FB50

Internet # 100122448

Store SKU # 839531

FlexBond Gray 50 lb. Fortified Thin-Set Mortar

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

$30.47 /each
Bulk Price Discount Available
This item qualifies for a bulk price discount
if you purchase at least 10 units. The
adjusted price will display in the Cart.


Model # FB50

Internet # 100122448

Store SKU # 839531

Store SO SKU # 1000063652

This Custom Building Products FlexBond 50 lb. Fortified Thin-Set Mortar is a premium-quality, polymer-modified mortar with exceptional flexibility and bond strength. FlexBond is perfect for tiling difficult surfaces, such as plywood, vinyl and laminates and for hard to bond non-porous tile such as porcelain and glass. FlexBond protects against cracking caused by minor in-plane surface movement.

California residents: see  Proposition 65 information

  • Suitable substrates include interior and exterior floors, countertops and walls
  • Can tile directly over cracks up to 1/16 in. without repairs
  • Suitable tile types also include natural stone, brick and thin brick
  • Exceeds ANSI A118.4 and A118.11 standards without the need for additives
  • Dries in 24 hours
  • Resists mold and mildew
  • Qualifies for a lifetime system warranty

Info & Guides

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Maximum coverage area (sq. ft.) 
Product Width (in.) 
Additive required 
Color Family 
Commercial / Residential 
Commercial / Residential 
Dry time (hours) 
Floor/wall use 
Floor and wall 
Flooring Product Type 
Ceramic Floor/Wall Tile 
Mold and mildew resistant 
Product Weight (lb.) 
50 lb 
Product type 
Warranty / Certifications
Manufacturer Warranty 
1 year product 


Rated 4.6 out of 5 by 21 reviewers.
Rated 4.0 out of 5.0 by Great choice for my bathroom floor!! As far as thin sets go, this was by far the better choice for replacing my bathroom tile! My last floor only 10 years old was cracked in places because I'd used economy thin-set & tile. This time I went with a better grade discount tile but liked the performance rating on this thin-set so I spent twice as much getting it, but feel it's going to fix my issues with cracked tiles from coming back! Right now my floor looks fantastic! Hope this one lasts for many years to come! January 21, 2015
Rated 5.0 out of 5.0 by flex bond fortified thin set Great product..Have used this for tiling a number of times. Easy to mix and use. Sets up relatively fast.. June 30, 2015
Rated 5.0 out of 5.0 by Excellent quality I used this Flexbond fortified thin-set mortar in my tiling project for a house with foundation problems. Even though the foundation was stabilized by a foundation repair company, it still shifts when water content changes in the soil under it. This is a slab foundation. I have other tiles in the house that cracked because of this. When I decided to put tiles down on other areas of the house, I was worrying about the cracking problem. Instead of putting the porcelain tiles directly on the concrete slab, I used a layer of backer board. I used this product to lay the tiles on the backer board. It held up pretty well. We have experienced quite a lot of shifting since then, but the tiles never cracked. I believe the flexibility of the flexbond contributed to this. I am very satisfied with the result. January 6, 2015
Rated 5.0 out of 5.0 by great product This was recommended by the tile guy. He said it is the best on the market in his opinion. My floor is solid and sound thanks to a great base. December 23, 2014
Rated 5.0 out of 5.0 by the best This is some sticky stuff. Fantastic for walls and floors. March 4, 2014
Rated 5.0 out of 5.0 by very easy to use This mortar mixes and spreads easily. Very easy to use and worked great for us. April 8, 2014
Rated 5.0 out of 5.0 by flexbond I used flexbond on a 2000sq. ft. modular home with plywood floors about a year ago and have had great success with it no tiles poping up or cracking great product ready to do another big project and will be using it again August 22, 2009
Rated 5.0 out of 5.0 by Good stuff Thinset what cin I say not fun to use but it works great July 22, 2014
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Store Exclusive. This item is available for purchase in select stores only.