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Under the bathtub: Durock or just subfloor?

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Under the bathtub: Durock or just subfloor? millinghill 07-09-2008
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Posted by on July 9, 2008, 4:15 pm
Dear Readers,
I'm renovating my bathroom: I removed the old cast-iron bathtub which
was sitting directly on the wood subfloor. I=92m also removing the
adjacent floor tile and its 1/4=94 plywood base, down to the subfloor as
well. I plan to put down Durock and lay floor tile above that.
Should I also put the Durock below the new cast-iron bathtub? Other
than a minor increase in elevation of the tub, is there any reason why
I shouldn=92t put Durock beneath the tub? All opinions appreicated.
Thanks.
-Theodore.


AppliancePartsPros.com, Inc.
Posted by RickH on July 9, 2008, 5:09 pm
On Jul 9, 3:15=A0pm, millingh...@yahoo.com wrote:
> Dear Readers,
> I'm renovating my bathroom: I removed the old cast-iron bathtub which
> was sitting directly on the wood subfloor. =A0I=92m also removing the
> adjacent floor tile and its 1/4=94 plywood base, down to the subfloor as
> well. =A0I plan to put down Durock and lay floor tile above that.
> Should I also put the Durock below the new cast-iron bathtub? =A0Other
> than a minor increase in elevation of the tub, is there any reason why
> I shouldn=92t put Durock beneath the tub? =A0All opinions appreicated.
> Thanks.
> -Theodore.

No reason you shouldn't do it and it would be good to do the whole
floor with it, next best thing to a real mud floor if you can make the
transition between the floor outside the bath. Install the tub, then
tile the remaining floorspace up to the tub, caulk tub base with
sanded caulk that matches the grout. Get all that 1/4 inch plywood
crap out of there, make sure subfloor is sound and not rotting before
you glue/screw the durock with durock screws (larger heads).


Posted by RicodJour on July 9, 2008, 5:58 pm
On Jul 9, 4:15=A0pm, millingh...@yahoo.com wrote:
> Dear Readers,
> I'm renovating my bathroom: I removed the old cast-iron bathtub which
> was sitting directly on the wood subfloor. =A0I=92m also removing the
> adjacent floor tile and its 1/4=94 plywood base, down to the subfloor as
> well. =A0I plan to put down Durock and lay floor tile above that.
> Should I also put the Durock below the new cast-iron bathtub? =A0Other
> than a minor increase in elevation of the tub, is there any reason why
> I shouldn=92t put Durock beneath the tub? =A0All opinions appreicated.

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

Posted by on July 9, 2008, 9:33 pm
> There's no real reason to have the cement backer board under the
> typical tub. =A0I 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? =A0Diagonal 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.

Posted by hallerb@aol.com on July 10, 2008, 4:51 pm
On Jul 9, 9:33=EF=BF=BDpm, millingh...@yahoo.com wrote:
> > There's no real reason to have the cement backer board under the
> > typical tub. =EF=BF=BDI usually just run it under the front edge a coup=
le 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? =EF=BF=BDDiagonal shiplap boards ar=
e
> > 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. =EF=BF=BDThanks for the advice.=
- Hide quoted text -
>
> - Show quoted text -

leave opening for plumbing, think drain and room to work from below.

a friend did a exact job with cement board under his tub. years later
he had troubles with no room to work.

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