Backerboard thickness for tile floor?


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Old 01-27-17, 12:26 PM
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Backerboard thickness for tile floor?

i currently have a 1/2 inch ply floor in bathroom + a 1/4 inch ply over the 1/2 where by old vinyl flooring was. if i rip up the 1/4ply and lay down 1/4 backerboard will that be sufficient for applying tile? thanks
 
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Old 01-27-17, 01:05 PM
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Probably not. What's the size, spacing and unsupported span of the floor joists?

Ceramic/porcelain or natural stone tile?
 
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Old 01-28-17, 05:50 AM
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Every tile is different, you have to refer to the manufactures guidelines.

A "general" guideline is 1 1/4" thickness of solid flooring.
 
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Old 01-28-17, 06:30 AM
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1/2" is too thin.
Also what's the size, spacing and free spans of the joist?
Tiles a one shot deal if you want it to not crack.
 
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Old 01-28-17, 07:17 AM
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total bathroom size is 80x 60

tile area is 60x60

i plan on using a 12x12 ceramic tile.

i don't actually have the floor pulled up, but based on the nail lines it looks like 16" gaps

What would be your recommendations on how to proceed with flooring? do i add another 1/2 ply and 1/4 backerboard although I currently only have just short of 1/2 from floor to top of door threshold.
Could i get away with taking out the top 1/4 layer and adding 1/2 backerboard? I'd prefer not to have a big rise into bathroom from hallway. thanks

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Old 01-28-17, 08:02 AM
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Bear in mind backer does not add strength needed to the flooring. If that is 1/2", then another 3/4" is recommended plus 1/4" backer. You may have to threshold the doorway, but it will be a more solid floor in the long run. And, yes, remove the 1/4" first.
 
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Old 01-28-17, 01:08 PM
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Biggest mistake in installing tile is get hung up on the difference in height created by the proper substrate.
 
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Old 01-29-17, 07:11 AM
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You can cut material off the bottom of the door to clear the new tile floor, done all the time.

1/2" ply + 3/4" ply + thinset + 1/4" backer board + Tile would be the optimal sandwich.
 
 

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