Does Metricon clean the concrete floors before flooring goes down?
It depends on what type of flooring. We are getting solid floorboards so the slab needs to be grind and leveled before it can be done. Floating floors wont need as much preparation as they lay the form sheets on top of the slab.
Renman you might find M will more than likely screed your concrete slab to obtain the correct levels. If your flooring is in your contract they will cover the cost of your floor preparations, if your flooring is being completed post hand over the slab leveling costs will fall to you. You can request your slab is laid within a certain tolerance to avoid the above completely but they might not guarantee it will happen.
I wouldn't be thrilled with anyone grinding my slab, if they hit the rio it can cause concrete cancer, if they grind to far they will have to screed to fix it.