Model # CBTSG50

Internet #100166653

Store SKU #610003

Custom Building Products CustomBlend Gray 50 lb. Standard Thinset Mortar

Custom Building Products

CustomBlend Gray 50 lb. Standard Thinset Mortar

  • Non-modified mortar
  • For installations over concrete floors
  • Mix with Thin-Set Admix Concentrate for higher bond strengths
$6.97 / each
If you buy 20 or more
$6.27 / each

Frequently Bought Together

Product Overview

Custom Building Products CustomBlend 50 lb. Standard Thin-Set Mortar offers economy with good bond strength for most tile projects and is recommended for floor installations. Good for setting Saltillo and other similar clay pavers. Offers good working time to apply and adjust tiles. For increased performance, use Custom Building Products' Thin-Set Admix Concentrate or Thin-Set Mortar Admix when bonding dense tiles (porcelain and glass) or setting over Exterior Grade Plywood (EGP), existing tile and for exterior applications.

California residents: see   Proposition 65 information

  • For installations over concrete floors
  • Mix with Thin-Set Admix for higher bond strengths
  • Covers up to 90 sq. ft.
  • Meets ANSI A118.1 without additives and meets ANSI A118.4 and A118.11 when mixed with Acrylic Mortar Admix

Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

Can this be used with Schluter Kerdi waterproofing membrane?

They reccomend using an unmodified thin set mortar for the installation of their waterproof membrane.
Asked by: Rong
you loose Schluter warranty installing it with modified - only when installing glass tiles or installing Ditra over plywood - read on their website or call them directly. Custom non-modified is a .... well, not the best as a non-modified thinset as it ONLY meets required standard, meaning there are better, blended with more Portland cement and less "sandy". IF you can't get a better grade non-mod...might as well go with a good quality modified and throw the warranty out - still works better, but curing time is longer
Answered by: nwphil
Date published: 2017-06-15

Can this be used applying tile against a hardibacker board as is without additive?

I already used it against hardibacker and I'm concerned if it will hold up? It seemed to adhere well.
Asked by: RJ
It will for a while. But overtime it will become brittle and break. I would go with one of the 15$ options.
Answered by: Tilefaceman
Date published: 2016-03-29

Can this be used for 6 x 24 ceramic tiles over schluter ditra?

Can this be used for 6 x 24 ceramic tiles over schluter ditra?
Asked by: Steve
use a non-modified thinset that exceeds the minimum ANSI standards requirements for time installation - this one is a low grade mix barely reaching it, hence the wording "meets" is like plywood being referred as solid wood - true but not quite a the real thing
Answered by: nwphil
Date published: 2017-04-06

Can this be used to lay bricks?

I need to build a small brick pit on a concrete floor. will this work?
Asked by: SS
CustomBlend Standard Thin-Set Mortar is not recommended to set brick in a fire pit. For further assistance please contact our installation division at 800.272.8786 option 2
Answered by: CustomBuildingProducts
Date published: 2017-05-04
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Customer Reviews

CustomBlend Gray 50 lb. Standard Thinset Mortar is rated 3.1 out of 5 by 32.
Rated 1 out of 5 by from I wouldn't recommend it for use with Ditra or Kerdi membranes. It is too sandy and difficult to ... I wouldn't recommend it for use with Ditra or Kerdi membranes. It is too sandy and difficult to work with compared to Versabond and other manufacturers' dry-set products. I used it to attach Kerdi membrane over drywall for a custom shower and I had to mix it fairly loose and work fast to get acceptable results. I had previously used Versabond with Kerdi on another shower with MUCH better results, even thought this technically voided Schluter's warranty for the Kerdi installation. My advice is to get something else if it is available, or use Versabond and wait a few extra days for it to cure properly. Home Depot should be embarrassed that this is the only dry-set mortar that they stock.
Date published: 2017-05-19
Rated 1 out of 5 by from Miserable Thinset I wish I can give zero stars but I can't. I used this for a Kerdi Mat installation over wonder board. I normally would never use either products but the homeowner insisted. It failed! I mixed it thick enough to hold a notch and 72 hours later it was still soft under the Kerdi and the unused thinset in the trash was soft as well. All of this was done in 60+ degree weather. I contacted Customs to let them know about the failure 24 hours later because I thought it was unusual for this to happen. The Tech Director promised to call back the next day but never did. I sent numerous emails with pictures showing their failed product from many different angles and also many phone calls to their tech support requesting that they would send out a rep and reimburse the labor and lost materials due to the failure of this product, only to be met with unreturned emails and phone calls. In the end I had to call from a different phone number just to get through to the Tech Director to be told that I would need to ship the 25 pound bag at my expense to their people who will test it to determine if it is faulty. I've been a tile contractor for 20 years and using their products for 30 years, but after this treatment, never again.
Date published: 2017-03-06
Rated 1 out of 5 by from Awful. Save yourself doing the job twice and get any other option So I used this product for 3 rooms of my house last year. One I have redone, the others are on my to do list. It does not stick well to the tiles or backerboard. I did not use the admix, which it claims "for higher bond strengths". I honestly believe they should rephrase it, "for ANY bond strength use the admix". The best thing I can say about this product, is that due to its weak bond strength, it makes tearing it out very easy. Obviously because you are going to replace it later with a better product. All the rooms I redid using other products have lasted with no problems. So I have a high level of confidence that the problem was using this.
Date published: 2016-02-08
Rated 1 out of 5 by from Bought to install Kerdi membrane on slab - Kerdi calls for "non-modified thinset." Mixed accordi... Bought to install Kerdi membrane on slab - Kerdi calls for "non-modified thinset." Mixed according to directions. First it took about 3 days to set. Secondly, once set, it had no adhesion and the membrane peeled right off. I suppose adding admix would help, but if you have to do that, why not just get a better fortifed thinset? (I used fortified thinset to install Kerdi membrane in a shower, worked fine.)
Date published: 2017-03-04
Rated 1 out of 5 by from Look elsewhere if this is for a Schluter project that requires unmodified thinset First of all, I am not commenting on the quality of this when used with an admixture. ONLY when using it as-is, which is what you should be doing with certain projects involving certain Schluter products. I really can't believe this is all Home Depot carries. If you're doing a Schluter project that requires unmodified thinset (without admixture) look elsewhere. This is a low-quality thinset for such projects. Find yourself some Laticrete 317, Megabond, Pro-Spec PermaSet, TEC Full Set Plus, or Schluter's own Ditra Set. If someone from Home Depot sees this, please get one of these other brands!
Date published: 2015-08-11
Rated 1 out of 5 by from steam shower membrane I'm installing a membrane for my steam shower and it called for unmodified thinset. I picked up a bag about 6 months ago and finally got around to doing the install. the darn stuff never set... I've made stronger sand castles. I checked the bag and suspected that it was a bad return, even though it didn't have lumps. a sticker was covering the manufacture date and it was made in 2008.... my bad.... round 2.... hosed off membrane, scraped sand off shower pan, and mixed up a fresh batch. this bag, and the other bags on the pallet were manufactured 15.10.23.... should be better.... nope! went to the website and found 404 error, so I can't email them... called the 800 number on the bag and got someone's voice mail. I've had great success with their regular modified thinset and the large format porcelain tile thinset, but this stuff is terrible!
Date published: 2016-08-09
Rated 1 out of 5 by from No Adhesion Mixed this this according to instructions, and applied to dampened backer board. However, was able to peel off Schulter Kerdi membrane from backer board with no effort after it set.
Date published: 2016-08-15
Rated 4 out of 5 by from Good Product with Ditra Used to install Ditra and Porcelain Tile on concrete as per Schluter-Ditra Installation Handbook 2014. Works great! Meets ANSI A118.1 which is what the Handbook calls for (Page 13). The bag states to mix with 6 quarts of water if not using the additive (the additive actually changes the spec to ANSI A118.4). 6 quarts of water is fine for laying the tile; it is not for the Ditra. Schluter Ditra requires the unmodified thin set to be "mixed to a fairly fluid consistency, but still able to hold a notch (page 24 of Handbook)" This is important! On a humid day it will take 6 1/4 quarts of water. If you do not mix it this way, you will never be able to get it to stick to the back of the Ditra (fleece webbing).
Date published: 2014-09-11
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