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Please, please ask all the questions you feel you need to before doing anything.
Look at some of the older post in this area and you'll see hundreds where there already into to it and have done it completly wrong and now want to know how to "fix" it.
 

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Tile comes in many sizes---and different materials----and is set with different thinsets----those are the factors that determine if back buttering is needed.

Answer those questions and you will get a real answer----
 

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Discussion Starter · #7 ·
oh'mike said:
Tile comes in many sizes---and different materials----and is set with different thinsets----those are the factors that determine if back buttering is needed.

Answer those questions and you will get a real answer----
Ceramic, 12" by 12" on concrete backer board with mortar
 

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12x12----very good idea you back butter the larger tiles---use a good quality modified thinset---
 

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Ceramic, 12" by 12" on concrete backer board with mortar
As a general rule, if the back of the tile (regardless of size) has a waffle shape, or just any sizable nooks and crannies, then back butter it. If the tile is large (starting at about 12"), back butter it even if it is smooth. Remember when you trowel your thinset to leave the furrows all in the same direction. Otherwise when you set the tile it will be difficult to avoid large air pockets underneath, because that would defeat the purpose of buttering anyway. (The furrows in the same direction help channel the air out as you lay the tile down.)
 
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