How do you prevent curling of floor slabs on grade, or how do you cause them to curl back down flat? We have had floors curl up several inches.
Curling occurs when the top surface shrinks from drying or carbonation while the bottom remains close to its original dimension. The floor may rise at junctions with columns or walls or at joints. It is not easy to reduce curling simply by trying to control the shrinkage. Shrinkage can be made to cause less curling by using joints at more frequent intervals. A curled floor may be made to go back down flat by thorough wetting by ponding for example. As soon as it is down it can be made to remain flat by sawing into smaller panels.