Reason for 1-1/2" mud depth [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile


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Greg Ebman
10-12-2006, 06:09 AM
Could someone explain why there is a minimum mud thickness for doing floors and what could happen if this isnt followed? I was just curious as I have seen a lot of posts asking about minimum mud thickness. Also, since Wonderboard is supposed to be like a mini mud bed, why can it be 1/2" and not 1-1/2"? Just a few question for the bored to answer for me :tup1:

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John Bridge
10-12-2006, 04:04 PM
Hi Greg, :)

Where did you get the 1-1/2 in minimum? I've floated a lot of floors at 3/4 in.

10-12-2006, 04:46 PM
I was taught (and have always followed):

less than 150 sf. 3/4" min., greater than 150 sf. 1 1/4" min.

Greg Ebman
10-12-2006, 05:11 PM
Hmm, not sure where i got 1-1/2 min :shrug: had that in my head i guess lol. I stand corrected. :o

Mountain Tile
10-12-2006, 05:25 PM
I was taught 3/4" minimum

10-12-2006, 05:56 PM
1 1/4 inch minumum for floating mud beds.

3/4 inch (or sometimes a little less) over lath stapled to wood flooring.

Bonded to concrete slab, from zero up to 2 inch.:)

10-12-2006, 09:24 PM
Inch and a half is the ANSI minimum thickness for shower floor mud bed, Greg.

I'm sure that's what you meant, right? :)

Greg Ebman
10-13-2006, 05:13 AM
Of course that is what I was thinking cx.. You guys couldnt read my mind?? :yeah: