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Unread 06-14-2022, 08:21 PM   #1
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Bathroom SubFloor Question

Remodeling the bathroom.
Ripped up old linoleum and particle board subfloor ~1/2 inch.

Underneath are 2x6 planks in good repair (see photo).

I would like to lay 1/4" backerboard over the top of these, perhaps with a thinset or leveling compound down first. Like the HardieBacker Fiber Cement Board .25 in

My wife is planning on applying thinset, schluter uncoupling membrane, thinset, then our 1/4" tiles.

Am I OK to use 1/4" backerboard as "subfloor" over these sturdy planks? If so, any recommendations as to thinset vs. glue vs other for underneath?

Am I instead forced to use 1/2" exterior grade plywood as a "subfloor"? The 1/4" backerboard is much more cost effective and pre-sized to our bathroom.

Thanks for your time and expertise

Healthcare worker, and mediocre DIYer
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Unread 06-14-2022, 10:30 PM   #2
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Welcome, Don.

Short answer is no.

You don't indicate what you have for a joist structure. If the joist structure is adequate (see Deflecto in dark blue bar near top of page), and if your joist spacing is 16 inches on center or less, and if your boards are in good condition and well fastened, the absolute minimum you must do is add a layer of nominal 1/2-inch exterior glue (there is no exterior grade) plywood with no face of grade lower than C.

On top of that you can add the tiling substrate of your choice, such as your proposed CBU, properly installed per manufacturer's instructions. Then your ceramic tile.

My opinion; worth price charged.

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Unread 06-14-2022, 10:48 PM   #3
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thank you for your prompt reply! I'll pony up for the plywood!
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Unread 06-15-2022, 05:49 AM   #4
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Check you floor structure first!
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Unread 06-15-2022, 08:07 AM   #5
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The Schluter Ditra handbook has a detail for this type of floor that may be helpful.
James Upton
How-to mix a small batch of thinset perfectly, every time.
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