How perfect does the thinset under the backer board have to be?


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Old 09-13-05, 07:53 AM
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How perfect does the thinset under the backer board have to be?

This was my first time mixing the mortar, and I think it was too wet (thick pancake batter). The ridges started to melt down while I was putting the hardie backer down. After all was said and done, I found a small spot where there was a hair of flex in the board so I drove a couple of more screws in and it feels solid now. I have the plumber comming in to rough in everything tomorrow, and don't have the time to rip everything up and start again .

Is there any chance that this floor won't fail?
 
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Old 09-13-05, 09:52 AM
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What did you install the CBU on, you shouldn't feel any flex, thinset or not.
 
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Old 09-13-05, 10:13 AM
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3/4 ply, then 1/2 ply. The subfloor is rock solid, there was just one point at the edge of the CBU in the 6 inch run between screws, if I pushed on the CBU, it would flex about 1/16" or less, to come in contact with the ply underneeth. I think there was a small void where the thinset was uneven.
 
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Old 09-13-05, 10:23 AM
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Sink another screw there, you should be fine, tape and thinset the joints with modified thinset while setting the tile.
 
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Old 09-13-05, 10:29 AM
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Thanks Tileman! I had a bunch of thinset left, so I taped the joints already. I just noticed today that I should have waited on that step . I may just whip some more up and skim a layer over everything once the plumber is finished before I tile.

Thanks again for all of the help! I don't know how anyone can get through a project without this messege board.
 
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Old 09-13-05, 10:34 AM
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No need to skim, just do this while setting your tile, so you don't have any speed bumps to deal with.
 
 

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