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[email protected] millinghill@yahoo.com is offline
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Default Under the bathtub: Durock or just subfloor?

There's no real reason to have the cement backer board under the
typical tub. *I usually just run it under the front edge a couple or
three inches so the tub is resting on it, and the rest of the tub is
supported by the wood blocking attached to the studs.

In your case, since the tub used to sit on the floor, it's probably
simplest to just complete the floor with the cement backer board.
It's a good place to use up some of the larger scrap pieces.

What is the existing subfloor like? *Diagonal shiplap boards are
usually uneven and the cement backer board may fracture over a hump.
It's generally a good idea to set the backer board in thinset when
you're putting it down to make up for any discrepancies and fill in
the voids so there's no movement.

R


Yes, subfloor is diagonal shiplap boards. Thanks for the advice.