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Old 12-15-2006, 06:05 AM   #1
John K
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Maximum mud bed thickness

I have searched the site and can't seem to locate the answer.

What is the maximum mud bed over a concrete slab? I have a job I'm going to look at that has 7 inch recesses in the slab. Why, I have know idea. These recesses are to get mud and then mosiacs. They are walkways around a baptismal in a church.

Can I float mud that thick over cleavage membrane with lath and not have a problem?
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Old 12-15-2006, 10:00 AM   #2
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I'm not Dave Gobis but my opinion is as long as it is a slab on grade and you can really compact a 7" thick mudbed it should be no problem.

Maybe they can pour 5" of concrete in there before you show up, still gives you 2" to play with.
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Old 12-15-2006, 03:51 PM   #3
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I remember seeing somewhere that the maximum thickness is 2". To be sure you should order The TCA Handbook.
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Old 12-15-2006, 04:04 PM   #4
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I've done patch work at 3" in a 8' x 8' area, but I had to beat the snot out of the mud to compress it...I also put a membrane down before tiling.

I would have serious reservations about trying 7" though....I second the 5" pour with a 2" mud bed.....
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Old 12-15-2006, 06:15 PM   #5
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I can remember mudding a dining room that was once a garage and it was 5-5 1/2 inches at the thick end. I packed it good without any problems. I don't really know what kind of problems to expect, as long as it's packed good, it ain't going anywhere.
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Old 12-15-2006, 08:31 PM   #6
MHI
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Use a portland slurry and 4000 psi concrete mix to fill it most of the way, if you are concerned about it.
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Old 12-15-2006, 09:10 PM   #7
Trivett_tile
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hot boxing

Can u hot box a mud bed?say u are putting a mud bed in a shower, its 9 pm u like 2 shovels to finish but no more mud bed till the next morning?
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Old 12-16-2006, 04:35 AM   #8
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Thanks Guys,

I think I'll go with filling partially with concrete. If I use fast set concrete and do a direct bond, instead of poly and lath to seperate. Do you think there would be a stress factor going over new concrete?
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Old 12-18-2006, 05:40 PM   #9
Davestone
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John, the way i understand the a.n.s.i, is anything over 31/2" of drypack needs more reinforcement, and more compaction, and a richer mix.I, myself would drypack it and not use a concrete mix,reasoning that two materials is less problems than 3 materials moving and compacting and setting. Trivett, you would need to bond the second mudbed with thinset, or a slurry, i would imagine.
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Old 12-18-2006, 09:18 PM   #10
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Anything unbonded needs reinforcement. The limitation on depth has to do with the size of the aggregate. You lose compressive strength after a few inches regardless of the sieve size. Need some stone if your hitting 3", then it is concrete. If you pour concrete and top it with mortar you may get some differential shrinkage. Not a problem if the mortar is on a cleavage membrane, but may shear otherwise. Lath won't do the job, need wire if you try it.
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Old 12-18-2006, 10:18 PM   #11
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I ran into that same problem and used 2 layers of Dow Styrospan insulation panels to build up to about 4".I set them in sticky thinset and then built the mortar bed on top of it with 2x2 mesh.

Makes for a good insulator and isolation membrane too.
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Old 12-18-2006, 10:25 PM   #12
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and the rest...
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Old 12-18-2006, 10:38 PM   #13
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and this one...
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Old 12-19-2006, 05:49 PM   #14
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Ron, nice job.
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