Basement Subfloor Height / Matching - Flooring - DIY Chatroom Home Improvement Forum

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Old 10-15-2014, 08:08 PM   #1
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Basement subfloor height / matching

Working on finishing our walkout basement and thinking ahead to the flooring. We're hoping to do engineered wood throughout most of it, then tile in the bathroom. I've been trying to figure out, 1) The best subfloor for each, and 2) How to get the height of each to match.

After some research, I took my best stab in the sketchup render here:

In case you can't see the image, it goes like this:

Living area: slab --> 6mm vapor barrier --> 1.5" rigid foam --> 3/4" plywood --> 1/8 underlayment pad --> 3/8" engineered wood

Bathroom: slab --> 6mm vapor barrier --> 1.5" rigid foam --> 1/2" plywood --> 1/8" mortar --> 1/8" ditra --> 1/8" thinset --> 3/8" ceramic tile

That puts both at the same height - 2 3/4"

My questions:

- Is it ok to put plywood directly on the foam (assuming you tapcon through both into the slab)? Or do you need sleepers in between?

- Would 1" foam be sufficient? We have 8 1/2 foot ceilings, but the less we're eating up with subfloor the better.

Make sense otherwise?? As a side note, I was considering Dricore for the living area, but since it's only 7/8" high, the wood floor would have to be built up to meet the tile floor.

Thanks for the help!
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