Having ripped up the solid oak flooring in my front room after it had failed in places, I'm debating whether the concrete slab is in good enough condition to even bother with the epoxy membrane & screed preparation required for a successful result. There is an enormous crack that I believe has been caused by the expansion of the failed oak floor - having checked my photos, there is no evidence of this when the floor first went in. The concrete floor itself is only 2 inches thick and I've noticed it does sound more hollow around the cracks. Ideally I would like to glue down engineered wood, but I don't want to spend all the money on subfloor prep (screed/epoxy?) if the underlying subfloor won't allow a perfect result. I'm therefore thinking of just shoving a carpet down as I don't have the time or money to rip up the subfloor and start again as I've done in the other rooms downstairs (for those that have seen my previous posts....) Thanks, Steve