Underlayment For 1 X 8 Subfloor

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Old 07-30-2017, 07:07 AM   #1
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Underlayment For 1 X 8 Subfloor

What would you guys consider best underlayment for an install with 1 x 8 subfloor. Have an install for kitchen/dining room with the old 1 x 8 diagonal subfloor and adjacent rooms are hardwood on top of the 1 x 8's. Need transitions to hardwood level as possible. 12 x 24 porcelain tiles.
TCNA doesn't mention anything about this situation.
Any ideas other than replacing 1 x 8's with T & G??
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Old 07-30-2017, 08:01 AM   #2
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Re: Underlayment For 1 X 8 Subfloor

If existing sub floor is sound, I'd put 1/2" ply and ditra over.

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Old 07-30-2017, 09:56 AM   #3
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Re: Underlayment For 1 X 8 Subfloor

The only way to not raise the finished floor would be to remove the subfloor, use 3/4 ply and ditra.

Otherwise ply and ditra added is probably best. I've also seen cbu thinsetted down to the 1x8s. I don't trust that, especially with 12x24 tile.
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Old 07-30-2017, 11:30 AM   #4
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Re: Underlayment For 1 X 8 Subfloor

Yeah, trying not to do replacing it, but might look like choice of that or higher transitions. Just wanted to see if anyone has any other thoughts.
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