The box is sealed with butyl tape into a clean up, dust totally free floor as well as airspace within is allowed to equilibrate While using the RH throughout the slab. Equilibration will take anything at all from 4 hours to 72 hrs depending on the slab thickness. Wait per https://juliusbyupk.wizzardsblog.com/32276056/an-unbiased-view-of-sub-floor-moisture