Hello,

This is my first post so thanks for any advice.

I’ve installed Prova Flex Heat underlay and ran Flextherm Green heated cable on top of concrete slab.

Flextherm and Prova both let me know this will work with the engineered hardwood If I Install a 1/2 inch of mass between the heated cable and the hardwood.

My question is what would work best... Float the floor with some kind of self leveller or ccement? Or cement board installed with thin set?

I’m at a loss as I haven’t came across this before.

Cheers!

Dry Pack

or

Gypcrete

are good options for in floor heating. I'd recommend getting advice from a concrete guy though. As always, make sure to get that base FLAT, not level, to 1/8th over 10ft if you're going to float the wood. Over in floor heating, I might be tempted to glue it down, as a floating floor requires more strict monitoring of your humidity situation to prevent failure, especially over in floor heating.

Make sure you've tested the system for a few days too, I've seen GC's lose sleep over having to redo the floor and dry pack cause there was a problem in the line somewhere and they didn't think to turn it on in advance to check.