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Old 11-17-2012, 10:37 AM   #1
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Can't get cement boards level


I'm installing tile floors for the first time. My subfloor is level, but as I lay my hardibacker I can't get the seams to level. They are perfect until I start to screw down the boards, then they shift up and down at random. Most of them are barely off, but one is almost 1/4" off. I'm assuming that's a big problem.

Before I lay tile, how can I make the boards level again at the seams?

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Old 11-17-2012, 10:47 AM   #2
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Can't get cement boards level


What are you using for tile backer? Are you bedding it in thinset?

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Old 11-17-2012, 10:53 AM   #3
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Can't get cement boards level


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but one is almost 1/4" off.
That's not possible. Are you missing a pencil or something?

What specific board. which screws or nails, thinset? Thinset under the board, what size trowel, are you fastening from center out or diagonally?

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Old 11-17-2012, 11:11 AM   #4
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That's not possible. Are you missing a pencil or something?

What specific board. which screws or nails, thinset? Thinset under the board, what size trowel, are you fastening from center out or diagonally?

Jaz
Hardibacker 1/2" board....thinset under the board with 1/4" notched trowel, hardibacker 1 5/8" screws...center out
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Old 11-17-2012, 11:16 AM   #5
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Can't get cement boards level


So far I've laid 5 boards and only one seam of one of them is significantly out of level. Could I use patch and leveler to make it less dramatic?
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Old 11-17-2012, 11:44 AM   #6
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Can't get cement boards level


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So far I've laid 5 boards and only one seam of one of them is significantly out of level. Could I use patch and leveler to make it less dramatic?
No. You are not painting or laying vinyl, you are installing ceramic tiles which do not bend much. The floor needs to be flat.

Either the floor was not flat to start, or you created the hump while installing the boards. I bet the board lifted as you were driving the screws which can easily happen with Hardie. Is the problem along an entire seam or just near a screw?

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Old 11-17-2012, 12:03 PM   #7
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Can't get cement boards level


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No. You are not painting or laying vinyl, you are installing ceramic tiles which do not bend much. The floor needs to be flat.

Either the floor was not flat to start, or you created the hump while installing the boards. I bet the board lifted as you were driving the screws which can easily happen with Hardie. Is the problem along an entire seam or just near a screw?

Jaz
Correct, the board lifted as I was screwing. The separation is roughly 1/2 of the 5-foot length of board.

Each board rose slightly as I was installing screws, but fell back to level as I tightened. This one seam refuses to go back down. I removed the screws and installed them again about an inch away from each original hole and that didn't solve the problem.
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Old 11-18-2012, 07:24 PM   #8
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Can't get cement boards level


Quote:
Originally Posted by SCarolina
Correct, the board lifted as I was screwing. The separation is roughly 1/2 of the 5-foot length of board.

Each board rose slightly as I was installing screws, but fell back to level as I tightened. This one seam refuses to go back down. I removed the screws and installed them again about an inch away from each original hole and that didn't solve the problem.
Well OK. I guess you knew what was happening but missed this section. Go ahead and cut this part out and redo it.

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Old 11-18-2012, 07:29 PM   #9
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Can't get cement boards level


If you predrill the holes with a masonery drill that will not happen.

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