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Realize that you're asking a fundamentally important issue if you're wondering how to trowel mortar when installing tile. Since we first published this CTEF Blog item on June 7, 2016, readers like you have helped make it the article with the highest readership since we first published it.
Not a terrific situation for the consumer, and a terrible situation for everyone engaged in properly installing tile. After that, let's talk about how to correctly apply the mortar. And there is another option is to mount your television on a wall that is covered in ceramic tile or wallpaper solely for the purpose.

What is the purpose of thin set mortars, large and heavy tile mortars, and other types of tile mortars?
Thin set mortars, as well as the new large and heavy tile (LHT) mortars, perform a variety of duties in a tile assembly.
They form a connection with the substrate.
They provide support for the tile.
They form a strong link with the tile's back.
As long as these three critical characteristics are present, the tile installation will give many years of trouble-free service.
The manner you trowel mortar for laying tile makes a significant impact in the final result. When put correctly on a sound substrate, porcelain tiles, in particular, may resist extra harsh service conditions by withstanding a great deal of impact or point load (think of high heel shoes, pianos, refrigerators, or pallet jacks) without breaking down. It is possible for the mortar to be improperly troweled, resulting in unsupported space under the tiles, which becomes weak places that are readily damaged by the same impact or large loads.

In order to avoid these problems, as well as tile breaking and the creation of a robust tile assembly, it is recommended that you follow these three steps:

You need follow three steps in order to correctly trowel mortar on your tile installation:
1. Make sure you have the correct trowel type and notch size!
Choose the suitable trowel type and notch size before you begin working with it.

It is not possible to properly hold the tile while using a "v" notched trowel because the narrow point of mortar does not give sufficient coverage.
Using a notch that is too small will prevent enough mortar from being placed and, as a result, the tile will not be adequately supported.

The mortar should be applied completely to the layout line!
Make certain that the mortar is completely dispersed all the way up to the layout line.

High heels, point loads, pianos, and refrigerators are all examples of areas where installers should stay away from the chalk line to avoid mortar squeeze-up in the grout joints. This can result in catastrophic failure, especially in areas where high heels are worn, point loads are used, and the grout joints are not sealed properly.
To avoid long-term problems with ceramic tile installation, adhere to well-established methodologies and industry best practices.

To properly trowel the mortar, keep your hands straight while doing so.
To get the best coverage on the reverse of the tile, trowel the mortar in one direction from left to right, as demonstrated in the National Tile Contractors Association Trowel & Error video (which may be seen at the conclusion of this article). Incorporate the tile into the mortar by pushing it back and forth in a direction perpendicular to the trowel ridges on both sides of the tile. This movement collapses the trowel ridges into the valleys, resulting in very few, if any, gaps in the mortar, which serves to hold the entire back of the tile during installation.

Trowel ridges that run in straight lines, as demonstrated in the NTCA film, are significantly more difficult to collapse. Furthermore, they aid in the elimination of air from the mortar, allowing for maximum coverage and a solid binding between the tile and the substrate.

The first step is to "key in" a coat of mortar into the substrate with the flat side of the trowel in order to create a strong mechanical link between the two materials.
Then, add more mortar to the substrate, combing the mortar in straight lines in one direction as you work your way down. Using a straight line to combine the trowel ridges improves the distribution of mortar on the trowel.
It is important to remember that while laying rectangular (plank) tiles, the trowel ridges should run in the same direction as the tile's short side. Due to the fact that air travels a significantly shorter distance when you bed the tile, it allows for better air release from underneath the tile.
You must be very careful not to leave any spaces between the chalk lines or between the tiles.
Make use of a trowel that will assist you in achieving a continuous coverage of at least 3/32". Larger tiles, in most cases, necessitate the use of deeper trowels.
Two nearby tiles are shattered in the shot below, with the pieces of the broken tiles being significantly lower than the unbroken tile immediately surrounding them. The reasons for the failure were numerous and complex. The installer did not use a recommended trowel to distribute the mortar, there was no mortar around the edge of the tile, and the installer was not qualified to perform the work. In this particular instance, the tile installer had been working on the project for a total of three weeks.
 
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