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Unread 05-03-2010, 08:20 PM   #1
tilelayer
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mud on slab

Can I mud a slab like this? Fasten 2.5 lb diamond lath with stub nails or a powerfastener with short nails and washers. With usual 2" over laps? Then mud away? Slab cannot be done with a bonded mud bed so this is the only way. The only thing is it will take awhile to fasten the wire but will it work? I don't like the method of putting the wire down and mudding over it unfastened. Floors tend to develop a hollow sound.
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Unread 05-03-2010, 08:22 PM   #2
Old World Tile and Marble
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why can't it be bonded ?
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Unread 05-03-2010, 08:47 PM   #3
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How thick a bed?
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Unread 05-03-2010, 08:50 PM   #4
michaelhazuka
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slipsheet won't work?? In essence your proposal is bonding the slab anyway, so why can't you bond?

it's either one of two ways:
1. slipsheet with isolation
2. bonded

Pick your poison.....
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Unread 05-03-2010, 09:13 PM   #5
tilelayer
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Bonded is out of the question.

Micheal I am not familiar with the slipsheet method. My normal way would be to soak the slab with water sprinkle thinset or pure on it the slab and use that to bond the mud. Works great for me, I can't bond to this slab because its got some epoxy coating on it.
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Unread 05-03-2010, 09:15 PM   #6
michaelhazuka
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soooo.......why the aversion to a slipsheet then? Just the sound?
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Unread 05-03-2010, 09:22 PM   #7
michaelhazuka
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Quote:
What is a cleavage membrane or slip sheet?

These terms are synonymous and refer to the sheet used between the mortar bed and the substrate. This sheet prevents the mortar bed from bonding to the substrate and allows it to "slip" if there should be movement in the substrate. Page 30 of the 1999 ANSI A108 standard lists many types of slip-sheets. from NTCA website
It's used when you don't want to bond a mud bed to the substrate.....I hate them, but sometimes you gotta do what you gotta do.....
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Unread 05-03-2010, 09:33 PM   #8
tilelayer
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I don't like the hollow sound this method leaves, Why can't I fasten the wire and do it like I suggest?
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Unread 05-03-2010, 09:37 PM   #9
irish tileguy in michigan
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Derrick, how big a floor, why not grind and bond.
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Unread 05-03-2010, 09:46 PM   #10
tilelayer
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cause the people are cheap
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Unread 05-03-2010, 10:04 PM   #11
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your kinda stuck between either one. In a way you are still bonding it to the floor with the nails. you would then still get a hollow sound cause the mud itself is not actually bonded to the concrete so you might as well slip sheet?
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Unread 05-04-2010, 07:12 AM   #12
John Bridge
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Unless you bond the mortar to the concrete you will have the hollow sound whether you use the lath or not. If you don't want the slip sheet, just throw the mortar down over the lath. It won't stick to the coating over the slab. There is absolutely no reason to attach the lath. Nails do nothing for strength.
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Unread 05-04-2010, 09:06 AM   #13
Deckert
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Would something sticky like 254 stick to the epoxy coating? If it does you could burn some 254 into the slab, let it set up over night and then put in your mud bed the way you normally do.
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Unread 05-04-2010, 11:10 AM   #14
ballardtile
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i agree with the above, i would just explain the options to the owner.
Best option= more expensive, grind the floor then bond the mud.
option 2= cleavage membrane/floating floor, hollow sound but its cheaper.

just make sure they understand that just because the floor sounds hollow it doesn't mean that the tiles arent bonded, it is just a product of the installation method that they chose. Explain everything ahead of time.
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Unread 05-04-2010, 11:30 AM   #15
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Welcome aboard, Bryce. Been out of town for a while.
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