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Unread 06-02-2005, 12:19 PM   #1
wessieball
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Leveling Thinset Bed On Walls?

My situation (which was explained in earlier threads...too lengthy to get into right now) involves putting 1/4" hardi over drywall in a bathtub surround. A few of you responded saying it was ok to do this (not recommended...but acceptable). I've primed the drywall and installed a 6-mil poly vapor barrier. I've siliconed the poly to the lip of the tub to seal it.

Here's my other situation. I've leveled the wall as well as I could with thinset to fill any dips but they still aren't perfect. I don't want any voids between the hardi and the drywall so I'm wondering if I can apply a leveling bed of thinset to the wall before I install the hardi (just like you'd do on a floor installation). I think that would work...just want to check first.
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Unread 06-02-2005, 01:21 PM   #2
jdm
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James Hardiei himself now allows 1/4" HardiBacker over studs spaced 16". While that may be pushing things a bit, I think it indicates that you don't have to worry about total contact between your drywall and Hardi. You'll still have way more support than just studs would supply.
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Unread 06-02-2005, 01:35 PM   #3
wessieball
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That's what I was thinking. To me it's insane that they allow 1/4" on walls. That stuff is pretty flexible at 16" in terms of somebody falling against it.
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Unread 06-02-2005, 02:34 PM   #4
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If for some compelling reason I really wanted to use 1/4" Hardi on walls, I would add blocking between the studs at 2, 4, and 6'. Your drywall should serve a similar function.
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