Just to follow up: After some reading, I think this subfloor is gypcrete. That's why it was real difficult removing the linolium adhesive without removing some gypcrete. I removed about 95% if the old lino adhesive hoping that's OK. So the Ardex GS-4 with Ardex P51 primer seems to be my only alternative. The next problem is finding the Ardex to purchase.

I was going to recommend the GS-4 also.

Dependable has one for gypcrete, too.

Thanks! Unfortunately, this is in a laundry closet where a front load washer would be located. For this washer, it seems ceramic tile is my only option but they don't recomend that over GS-4. Are there any alternatives for my situation? Thanks so much.

Oh, your going to need an isolation membrane.

Thanks, Floorguy, for all of your help and advice. Can you please give me an example of an isolation membrane and what is it used for? I just read about a floating tile called Snapstone. Any opinion on it? What's the best floor finish alternative for a front load washer for someone im my situation? Thanks so much, John.

Schluter Ditra