Hi Guys, I have a number of freezer floors about 800 sq.ft each. The slab is 6” thick concrete on insulation and vapour barrier. There are some cracks and there is minor damage to the surface of the floor. There is no evidence of heaving or any issue with ice damage under the floor. What would be the pros and cons for adding a sand layer on the existing slab, polyethylene sheeting on the sand and pouring another 6” slab? Ceiling height is not an issue.