Custom Building Products

Model # UMMG50

Internet # 202935096

Store SKU # 266437

50 lb. Gray Uncoupling Mat Mortar

  • Non-modified mortar
  • For use with uncoupling mats and membranes
  • For basic tile installations



Model # UMMG50

Internet # 202935096

Store SKU # 266437

Store SO SKU # 1001490986

Custom Building Products Uncoupling Mat Mortar is a non-modified thin-set for Schluter-DITRA Uncoupling Membrane or other uncoupling systems. Provides good bond strength and performance when used in conjunction with uncoupling systems. Mix with thin-set mortar admix for increased bond strength and flexibility (sold separately). Suitable tile types include vitreous, semi-vitreous or non-vitreous tile: ceramic, mosaic, quarry, cement body tile.

  • Dries in as little as 24 hours
  • Covers up to 200 sq. ft.
  • Mold and mildew resistant
  • For interior and exterior use on floors, walls and countertops
  • Exceeds ANSI A118.1 when mixed with water
  • Exceeds ANSI A118.11 when mixed with thin-set mortar admix

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 
Flooring Powder Mortar 
Mold and mildew resistant 
Product Weight (lb.) 
50 lb 
Product type 
Warranty / Certifications
Manufacturer Warranty 
1 year warranty 


Price: $10 - $20
Review Rating: 2 & Up


Rated 2.7 out of 5 by 6 reviewers.
Rated 2.0 out of 5.0 by Don't use this, buy a better brand This stuff is horrible, used for one wall, may have to redo it because I just don't trust it. Going back to laticrete. January 27, 2016
Rated 5.0 out of 5.0 by Great Product! This product pairs perfectly with the Ditra underlayment sold at Home Depot. I used Versabond under the membrane to adhere to the plywood and this between the tile and membrane. It applied easily and held ridges well. It also has a decently long work time, so you don't have to worry about wasting mortar. Cleanup was a breeze as well, anything that was accidentally dropped on the tile came right off. I would highly recommend this for a easy install! The tiles in the photo are also from Home Depot, MSI Onyx Sand 12x24. August 3, 2013
Rated 4.0 out of 5.0 by Worked well I used this mortar based on an on line suggestion on a tile site. It was much creamier and easier to mix than other mortars I had used. It created a great bond between my wall tiles and Schluter membrane. I had a hard time removing tiles to check for good coverage! So far so good! Had no trouble with odor mentioned on a review of the white mortar made by same manufacturer. June 13, 2015
Rated 2.0 out of 5.0 by Caution - ignore the directions Used exactly the amount of water specified on the bag and it was too runny. It would not hold the tile in place well and the mortar spread too much and came back up through the joints creating a mess. Probably a rookie mistake, should have started with less water and added more if needed. December 13, 2014
Rated 2.0 out of 5.0 by Nice looking bag The mortar was located 70 miles from where the Schluter materials were purchased. 140 mile drive to purchase the mortar for an installation. July 2, 2013
Rated 1.0 out of 5.0 by gray bag no good had to do project over had my wife upset at me December 17, 2012
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