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I am installing a drop-in tub, and built a platform for it. Do I need to lay down some plywood on top of the framing, to attach the cement backer to (Diamond Back, most likely)? The large expanse on the right side already has plywood because it is a large area.

Framing

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    Given that backer board is typically installed to studs, I wouldn't think so. – Ecnerwal Jul 25 at 12:38
  • This situation is a little different. It's more like a floor. – isherwood Jul 25 at 13:15
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No, you don't. Doing so could be a way to stiffen and reinforce the framing, but it's not required.

I'd be sure your corner laps are all secure and well supported. The left end in particular concerns me a little--that's a fairly long span for flat lumber. If there's any chance of movement, add framing underneath and screw things together well. Construction adhesive would remove all doubt.

The key is to eliminate movement (flex) under the load of the tub users. (The tub itself shouldn't rest on the deck at all.) If you can see or feel movement under your own weight, it needs work.

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    Correct, Kohler says that the lip SHOULD NOT bear any way. I plan to set it in a mortar bed if I need to tweak the height. – Buck Jul 25 at 13:04

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