Bathtub Over Subfloor Or Underlayment. - Kitchen & Bath Remodeling - DIY Chatroom Home Improvement Forum
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Old 06-15-2010, 09:12 PM   #1
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Finally have the new drywall painted getting ready to install the Kohler cast iron tub I bought several months ago. I know I'm probably overthinking this. I was originally planning to put the tub in directly on the subfloor which is Advantex. I don't see the benefit to putting my 1/4 inch luan underlyament under the tub except if it is important to keep it level with the rest of the floor. I will be putting vinal tiles on the luan. Does it matter which way I do it or is it really just personal preference? The other consideration is getting the tub in without damaging the underlayment.

Original post was under the wrong topic
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Old 06-15-2010, 09:36 PM   #2
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Tub on the subfloor---then underlayment.(helps to hide the tub edge and any gaps.)

Luan ply is a poor choice for underlayment--absolutely falls apart if it gets wet.

Let's see if Rusty has a suggestion on underlayment--I trust his opinion.--Mike--
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Old 06-16-2010, 02:53 PM   #3
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My better instinct told me that Luan was not good. Now I have to return it. I'm ging to learn not to listen to these HD guys one of these days. There are a few older tradesmen there that know what they are talking about but not many. Lowes has some better looking grades of 1/4" Ply. Might be AC/BC fir round.
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Old 06-16-2010, 04:39 PM   #4
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That would be better.On the rare occasions that I install vinyl flooring I use muli-Ply
4x4 sheets with green X's --water proof glue--hardwood ply. Pricy stuff but no failures.

Rusty must be working--Any way that's what I use--I think the AB will work,too.
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