Ceramic Tile Floor Mortar

Use gray thinset for ceramic and stone tiles that are dark or deep in color. However, many types of marble, glass, and other kinds of tiles are slightly translucent, so a gray mortar would slightly muddy their color. For these tiles, use white thinset, which costs only a little more. 

How to do it:

1. Use a square-notched trowel with ¼-inch notches produces grooves of the right thickness for the tiles. For thicker tiles a larger notched trowel is recommended.

2. Only mix enough mortar that is within your capability to work before drying out, about enough to cover three square feet. If the mortar starts to dry out or harden while you work, throw it out and mix a new batch. Do not try to rejuvenate by adding liquid or you will have a weak mortar that will not hold the tiles in place.

3. For DIY household projects mix the mortar by hand in a suitable bucket or plastic wash tub. A margin trowel or garden trowel is the best tool for mixing. Add a couple of inches of liquid to the bottom of a bucket and pour in some powder. Stir with the trowel, scraping the bottoms and sides as you mix. Add the liquid slowly to avoid adding to much. Keep mixing until you attain a consistency that still holds its shape and is barely pourable.

4. Spread the mortar by dumping scoop onto the floor. Use the flat side of the trowel to spread the mortar over an area about 3 feet square.

5. Do not cover any layout lines. Comb the mortar using the notched side of the trowel to produce an even surface. Use long strokes and hold the trowel at a consistent angle. The mortar cement may cause skill irritation, so use gloves to protect your hands.

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