Model # FB50

Internet #100122448

Store SKU #839531

Store SO SKU #1000063652

Custom Building Products FlexBond Gray 50 lb. Fortified Thin-Set Mortar
0010186269849

Custom Building Products

FlexBond Gray 50 lb. Fortified Thin-Set Mortar

  • High flexibility to prevent cracks in tile
  • Excellent bond strengths
  • Outstanding bond to glass, metal and other decorative tile
$30.47 / each
If you buy 10 or more
$27.42 / each

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Product Overview

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



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Customer Questions & Answers

Can this be used for ceramic tile over plywood?

Asked by: Chris
NEVER install ceramic tile directly on plywood. Why? The plywood expands and contracts with humidity and temperature changes. Very slightly, but it does move. Ceramic or porcelain tile will move too, but SIGNIFICANTLY less than plywood. What happens when plywood is shrinking or expanding, and the tile can't keep up? Cracks, grout joints crumbling, and tile coming loose. Use some backer system - a concrete board or uncoupling membrane.
Answered by: WeaversCarpetAndTile
Date published: 2016-12-05

I'm laying a 5/16 in thick (10in x 14in) ceramic tile. As this tile is almost at the 15in thresh...

I'm laying a 5/16 in thick (10in x 14in) ceramic tile. As this tile is almost at the 15in threshold, should I use "Flexbond" or the "Natural Stone and Large Tile" mortar??
Asked by: John
I would probably use large tile thinset, but I'm sure either one will work just fine if the application process is correct.
Answered by: Dawn
Date published: 2017-01-27

What is set time before you can walk on the tile

Asked by: lm
24 hours
Answered by: Chilly558
Date published: 2016-11-02

What is the dry time at 50 degrees?

Asked by: Mike
Not sure. It sets up at 60 degrees in 18 hours, to the point that you can step on the tile without worry. I would wait at least 24 hours at 50 degrees.
Answered by: JimD
Date published: 2017-01-31
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Customer Reviews

FlexBond Gray 50 lb. Fortified Thin-Set Mortar is rated 4.6 out of 5 by 91.
Rated 4 out of 5 by from So far so good. This thin-set mortar remains workable for an hour, which gives me time to get ed... So far so good. This thin-set mortar remains workable for an hour, which gives me time to get edge and corner tiles installed without worrying about the mortar setting up before I'm through. I have completed two bathrooms, and probably won't know for years how good it is at "crack prevention". It mixes quickly with water, with minimal problems with lumps remaining in the mortar after mixing. It costs just under $30 before tax at my local store, which seems expensive, but the relatively slow setting is worth it to me. I have about 2,000 square feet of tile to lay in the rest of the basement, and will use this product despite the high price.
Date published: 2017-01-31
Rated 1 out of 5 by from The product is fine, Home depot storage was the problem. It was full of hardened clumps and I end... The product is fine, Home depot storage was the problem. It was full of hardened clumps and I ended up throwing out over half the bag at my expense. It is nearly impossible to check for moisture clumping unless there are obvious signs on the exterior of the bag.
Date published: 2017-01-07
Rated 5 out of 5 by from Great product I recently used Custom while nstalling 48x7 wood look porceline on a concrete slab in a basement. I was very happy with their mortar simply because of the open time. The open time after it was mixed was over an hour, of course i had to throw the mixing wand in and remix a couple of times. The initial bond was about 5 hours and after he recommended 24 hour time, I was a permenant fixture.
Date published: 2017-05-16
Rated 4 out of 5 by from Flexbond (both white and grey) is a great and preferred type of thinset for laying tile in the sh... Flexbond (both white and grey) is a great and preferred type of thinset for laying tile in the shower - I have used it in multiple applications. It covers wells, sticks well, but dries very fast, so don't mix too much, and do apply some extra on each tile if it started drying on the wall faster than you wished.
Date published: 2016-12-20
Rated 5 out of 5 by from Very thick, dry, and labor intensive compared with thinner mortars... Very thick, dry, and labor intensive compared with thinner mortars used for smaller tiles. 4.7L wasn't always enough to wet all the mortar. My 3.0 amp Craftsman drill was barely enough to mix this mortar while others are easily mixed. I recommend wetting each tile with a sponge before applying
Date published: 2017-03-28
Rated 5 out of 5 by from I've used this stuff for a long time. And a lot of it! It's certainly more expensive than some bu... I've used this stuff for a long time. And a lot of it! It's certainly more expensive than some but there's a reason for that. You don't want to risk using cheaper material. It could mean replacing tiles or an entire floor!
Date published: 2017-02-28
Rated 4 out of 5 by from FlexBond Fortified Thin-Set I used this thin-set for an external slate tile project. It is a bit difficult to mix but has worked well in the actual tile setting. Too early to tell if expansion and contraction will be an issue that results in cracks.
Date published: 2016-12-06
Rated 5 out of 5 by from put them right over the old tiles and they stuck... put them right over the old tiles and they stuck so far so good let you know in a couple years how it went but overall very easy to work with and it does everything that it says it will
Date published: 2017-05-05
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