Waterproof floor for bathroom

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Old 05-20-19, 11:34 AM
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Waterproof floor for bathroom

Hi, I am having trouble finding what material to use for a bathroom floor. I found some building codes that said, "waterproof fiberboard" but when I search for the at Lowes etc I get a lot of MDF options. Pretty sure that's not what I need.
I have seen the grey looking sheet stuff somewhere, but danged if I can find what it is called to order it. Can anyone help here?Thanks
 
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Old 05-20-19, 12:02 PM
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Do mean the room floor or the shower floor? Typically the floor covering [tile,vinyl] is sufficient for the bath room floor. The shower floor uses a membrane under the tile or a pan.
 
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Old 05-20-19, 12:04 PM
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If you are referring to the shower/tub those areas need to be "waterproof" but the remaining area of the bath does not get special materials!
 
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Old 05-20-19, 01:15 PM
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Thanks, but I mean the real floor, not a floor covering. As in, a hole through to the ground if there is none.
We want to submit a Permit for an en-suite and pretty sure the current plywood flooring is not going to be Code for a potentially wet area. I thought there was some concrete-mix-type-fiberboard or something. It is that name I am searching for.
 
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Old 05-20-19, 02:05 PM
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Most residential bath rms are built over a wood sub floor.
 
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Old 05-20-19, 04:14 PM
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I would ask the local AHJ first, as I think you are currently misunderstanding the requirement.
 
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Old 05-20-19, 04:35 PM
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concrete-mix-type-fiberboard or something
I think you are referring to CBU, that is the cement board used to install tile on. It would be used under tile both in the shower and under the tile on the floor but only the area in the shower would need membranes or coatings to make it waterproof!
 
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Old 05-21-19, 09:53 AM
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@Marq1: That's the term I needed. Cement Board. It's only a toilet and hand basin en-suite, no shower, but I wanted to use the correct materials.
Thanks.
 
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Old 05-21-19, 02:05 PM
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1/4" cement board is all you need for floors .... unless it needs to go higher to meet the flooring in the hallway. If 1/4" plus the tile is to tall you can skip the cement board and use Ditra.
 
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