Well dear. As a VDF contractor I have a doubt, if it's compression up to 3mm due to the De watering process (on 150mm thk) then how can we achieve the super flat floor
If there is no cracks in concrete no need to make groves. Just to avoid cracks in concrete we introduce groves. & really if u want to go for groves no problm you can do at anytime for design purpose
Old wine in a new bottle. This type of flooring is being done with expantion joints grouted with bituminus pad. Name wearing coat to carry class AA loading. For domastic, indentrial floor finish for car parking, rough use Ellies pattern flooring with expantion joints filled with bituminous grout for 100 mm thick. Working cost is cheaper than your VDF flooring