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Old 08-05-2009, 09:10 AM   #1
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laying hardiebacker over osb


I am getting ready to put down 1/4" hardiebacker over osb subfloor....for use between these two materials, hardie recommends a dryset mortar with ansi spec of A118.1....for the tile on top of the hardiebacker, it looks like they recommend a latex or acrylic modified thinset complying with ansi spec A118.4 (Versabond Flex falls under this spec)....since I am a complete tile newbie, any suggestions....thanks

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Old 08-06-2009, 12:05 AM   #2
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laying hardiebacker over osb


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Originally Posted by moegumble View Post
hardie recommends a dryset mortar with ansi spec of A118.1
That is not really what Hardie says. They tell you either non modified or modified is OK for under the board, but use modified to set the tiles to the board.

If it's a small job you may as well just buy one type, the modified. On large jobs you can use the cheaper unmod to set the board. I think Hardie is one of only a few that suggest unmod at all. Most other brands want you to use modified to set the board and the tiles.

Other tips? Heck there are hundreds of things. Like spacing the sheets and expansion joints to name a few.

Jaz

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Old 08-06-2009, 05:05 AM   #3
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laying hardiebacker over osb


I understand what you're saying about the modified and unmodified....and, yes, I've already blown gaskets in my brain with all the little details....on the upside, i've cut the hardiebacker panels to fit exactly as specified, which was interesting due to angles, holes and cutouts..
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