Which types of subfloor pose most risk of moisture?

As the installation of a damp proof membrane in new buildings only became mandatory in 1965, the ground floor levels of buildings which were constructed before this date should be subjected to a moisture measurement test. Moreover, if a building has been compromised by a leak at some point, the floor should be tested, even if it is above ground floor level.

New buildings will incorporate a damp proof membrane, but they still remain susceptible to moisture as the drying time of a new sand/cement screed is estimated to be 1mm per day up to a thickness of 50mm. A 150mm thick concrete subfloor can take up to a year to dry out naturally. Therefore, to ensure that a concrete subfloor is sufficiently dry to receive a floorcovering, all new build projects should be tested for moisture.

Thursday, February 11, 2016