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Old 02-04-2009, 01:08 PM   #1
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How big of a gap in hardie board can I fill with thinset?


I am putting porcelan tile down in my bathroom, and have cut the .5" hardie backer and laid it down in the room. I left a 1/8" to 1/4" space around the perimeter and between the boards like the instruction said, but in the door frame where I cut the hardwood floor up, there is a gap about 1-1.5" between the hardie board and the hardwood. can I just fill this little gap with thinset when I cement the hardie board down or do I need to cut a little sliver of hardie board to go in there?

I mean... cement thinset is pretty much the same at cement backer board right? theoretically, you could just pour a .5" thick layer of thinset on teh subfloor to put your tile on.

Thanks
-Eric

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Old 02-04-2009, 07:01 PM   #2
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How big of a gap in hardie board can I fill with thinset?


I have done thinset in very small places like that and it has worked just fine. I have even done grout like that where it's too small to cut a tile and it worked just fine. You would think that it would crack, but it doesn't. Good Luck!

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Old 02-04-2009, 07:18 PM   #3
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How big of a gap in hardie board can I fill with thinset?


I have done thinset in very small places like that and it has worked just fine. I have even done grout like that where it's too small to cut a tile and it worked just fine. You would think that it would crack, but it doesn't. Good Luck!
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Old 02-05-2009, 07:46 AM   #4
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How big of a gap in hardie board can I fill with thinset?


Thanks for the reply... thats what I was hoping

my drill battery dies last night, and I only got one sheet of hardie board down, but tonight I plan on finishing it.

After re-reading my original post I thought I would clarify one thing: the gap is around 1" to 1.5" wide but it the entire length of the door frame (28"), so about 30-40 square inched total... dont know if it makes a difference.

Thanks,
Eric

Last edited by Constant Improvement; 02-05-2009 at 07:48 AM.
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Old 02-05-2009, 10:41 AM   #5
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How big of a gap in hardie board can I fill with thinset?


I disagree. Just spend the time to put a piece of CBU in the gap. Thinset likes to shrink when it cures. I'm not comfortable with anything over 1/2" thick.
If you attempt this, 2 things might happen:
1. The thinset will shrink and you'll lose bond to the tile
2. The thinset will remain bonded to the tile but pull the tile with it and SNAP

For a gap that large, just add the CBU.
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Old 02-05-2009, 10:49 AM   #6
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How big of a gap in hardie board can I fill with thinset?


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Originally Posted by angus242 View Post
I disagree. Just spend the time to put a piece of CBU in the gap. Thinset likes to shrink when it cures. I'm not comfortable with anything over 1/2" thick.
If you attempt this, 2 things might happen:
1. The thinset will shrink and you'll lose bond to the tile
2. The thinset will remain bonded to the tile but pull the tile with it and SNAP

For a gap that large, just add the CBU.
OK... I'm glad I asked the question then. If there is any concern at all, I might as well just do it then (not like its that hard). I just wasent sure whether having a sliver of hardie board that thin, or an area of thinset that thick, would be worse...

Thanks
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Old 02-05-2009, 10:49 AM   #7
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How big of a gap in hardie board can I fill with thinset?


I'm with Angus 100% on this. You should cut a narrow strip of backerboard and set the backerboard strip in thinset as required, then screw or nail it down.
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Old 02-05-2009, 10:52 AM   #8
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How big of a gap in hardie board can I fill with thinset?


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Originally Posted by thekctermite View Post
I'm with Angus 100% on this. You should cut a narrow strip of backerboard and set the backerboard strip in thinset as required, then screw or nail it down.
check... thanks guys.
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Old 03-21-2011, 07:43 PM   #9
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How big of a gap in hardie board can I fill with thinset?


This is why I love mud set

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