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Unread 05-09-2006, 12:33 AM   #1
framer
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is construction adhesive ok under durock?

the way i've seen others install durock on floors is to put construction(subfloor) adhesive every 4 to 5 inches or so in rows and the put 1/2" durock and then screw and nail. is this method ok?

if thinset is the only recommendation for under durock, does it have to be 1/2" or can it be thinner(1/4"?)?

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Unread 05-09-2006, 04:24 AM   #2
scott anthony
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Liquid nails under cement board is for hacks, there better off with nothing. A line of glue just leaves vacant space beside of it waiting to flex if not screwed perfect. The thin set should be troweled for full coverage, as long as you have no voids your OK. Only do one sheet at a time with a 1/2 inch trowel with the thin set just a little wetter than normal, and tape. Double your screws along the outside edging where they may be traffic.
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Unread 05-09-2006, 04:36 AM   #3
Tileworks
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Quote:
the way i've seen others install durock on floors is to put construction(subfloor) adhesive every 4 to 5 inches or so in rows and the put 1/2" durock and then screw and nail. is this method ok?
Absolutely not. Scott Anthony is correct in saying that this method would be more likely to fail than if one had used nothing at all. The thinset is needed here primarily for leveling, not bonding. Thinset will eliminate voids, glue-in-a-tube will create them.

Quote:
if thinset is the only recommendation for under durock, does it have to be 1/2" or can it be thinner(1/4"?)?
The Durock can be 1/4" board, as opposed to 1/2" board. If you are referring to the thinset layer itself, a 1/4" trowel is the minimum requirement.

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Unread 05-09-2006, 06:58 PM   #4
Tool Guy - Kg
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If the subfloor is only a single layer of 5/8", Durock says you need to go with their 1/2" board.

Whichever you use, you can use a 1/4" square notched trowel.
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