Hardi-Board is down, but it "bounces"


Old 04-15-07, 08:36 PM
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Hardi-Board is down, but it "bounces"

We just laid down the hardi-board in our bathroom. We used mortar and then screwed it down. There are a couple of areas where there is a little "bounce" in the board when you walk on it. Is this going to cause the tile to crack if we lay it down over ther? Is there a way to correct this? Add more screws?

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Old 04-16-07, 01:40 PM
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It may be one of those things that needs to be seen to understand what is going on but usually bounce is associated with flex in the floor joists which may be undersized or overspanned. Bounce can also occur between joists when the subfloor total layer of plywood is too thin. The cement board does not add any structural strength to the floor so any bounce present before will still be there after the board is installed.
Old 04-16-07, 06:27 PM
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Any movement tends to cause grout failure and increases potential for cracked tiles.

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