CTEF Blog - About Tile Education and Installer Certification

Do you back butter your tile?

Back buttering tile is a highly opinionated and widely debated topic among tile installers. Although it's recommended for natural stone tile, it's not always necessary or required to get adequate mortar coverage on ceramic and porcelain tile. So, how important is it?

To begin this discussion, we first need to define several words.  According to the NTCA Reference Manual:

When you install tile, do you ensure that you have enough mortar to accommodate inherent (actual) tile warpage associated with large format tile?

Tile sizes are changing; getting larger, longer, and proportionately having more inherent warpage. Likewise, changes are being seen in tile installation methods, using thin set and large and heavy tile mortars to accommodate tile warpage.

Let's review what's involved.

We've all seen it: that really ugly white powder that grows on cement grout and also tile, stone, brick, and concrete, particularly when it's installed someplace with moisture (i.e., in a basement or outdoors). That white residue is called efflorescence.

This article goes into detail about efflorescence, including situations that readers have shared with us since the article was originally published in September 2016.

What Do You Use to Patch Your Substrate so It Is Ready for Tile?

You've surely been in the position as a tile installer to deal with job site conditions that require the substrate (floors and walls) to be patched making it “tile ready”.  No question, it's critical to get the substrate flat enough to accommodate tile.  This is particularly true if the tile is large format.

As a conscientious tile installer, do you take the time to protect bathroom fixtures before you start your installation?

If you're asking how to trowel mortar when installing tile, realize that you are asking a fundamentally critical question. It's so critical that readers like you have made this CTEF Blog article the one with the highest readership since we originally published it on June 7, 2016.

You see, when thin-set mortar is incorrectly applied, the installation will many times fail. More likely than not, the tile will break - as you see in the image below.

Not a good situation for the customer and a terrible one for everyone involved in installing tile correctly.

Let's focus then on how to properly apply the mortar.

How familiar are you with the ANSI Standards for the Installation of Ceramic Tile? (ANSI stands for the American National Standards Institute.) If you aren't, and you're in the tile installation business, it's time you pay attention. ANSI Standards are a tile installer's best friend! 

If you're in the tile business, you're surely aware of how important it is to obtain the required mortar coverage.

And, you've probably noticed that achieving that coverage has become more challenging as tile sizes and the diversity in tile types increase.

Diversity is wonderful for enabling stunning tile installations. However, each of these products has different requirements in order to achieve the required mortar coverage, and that's where selecting the right trowel notch comes into play.

I certainly hope you don't ignore grout manufacturer directions which just about guarantees that your tile installation will fail. In fact, that's true for just about all the products tile installers use. For the sake of this article, though, I'll focus on grout and more specifically High-Performance Cement Grouts.

Here's why you need to take the grout manufacturer's directions seriously.

How concerned are you with protecting your tile installations from the horrors of bond breakers? If you're serious about it, you will spend time inspecting and preparing your substrate so as to prevent any situations from developing. Yes, substrate preparation includes determining whether the floor or wall surface will be bondable, and, most importantly, this needs to be completed prior to installing tile.