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Old 06-21-2012, 04:19 PM   #1
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Tiling bathroom floor - hardibacker question


I was told that when screwing the hardibacker down to the floor in a bathroom I will tile (2x6 subfloor) I should mortar under it to give it the most solid base it can get.

It seems to me if I am screwing it down every 6 inches anyway it's pretty solid and it will be a bear to rip up the next time the room is re done... does it make sense to mortar under the hardibacker?

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Old 06-21-2012, 04:42 PM   #2
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Tiling bathroom floor - hardibacker question


There's low spots between every floor joist, the thinset will fill the gaps so you get 100% contact.
A tile floor can not work with any flexing, the grout will crack and the tiles will crack.
I'd be very concerned with just 2 X 6 floor joist unless there's a very short span.

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Old 06-21-2012, 05:07 PM   #3
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Tiling bathroom floor - hardibacker question


I'm wondering if he is saying his sub floor is 2X6?
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Old 06-21-2012, 06:11 PM   #4
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Tiling bathroom floor - hardibacker question


Joe said it clearly---add the mud---let the next owner worry about how to remove it.

This method is especially important with Hardi--it's like a spring--and will bridge a void instead of contouring to the low spots like Durrock or Wonder Board.

Add the mud---
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Old 06-22-2012, 11:23 AM   #5
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Tiling bathroom floor - hardibacker question


I should hvea been more clear, subfloor is 2x6 tng over 4x8 joits which I think are 24 inch span post and pier (I can easily crawl between them but it's not spacious).

The floor is not noteably springy anywhere but it's sure no concrete slab either. The biggiest issue is that the house shifts during wet and dry weather so there is no getting away from the floor changing shape mud or not.

That said if it's adviseable all the same I will go ahead and lay it down with the mud. I just didn't want to do it for now reason.

Theory is I will be the one doing the next remodel also and will have to deal with it...
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