![]() Where subfloor relative humidity levels are below 98%, you can use Stopgap F77 to create an effective barrier against rising damp and residual construction moisture. In this instance, you’ll have to remove the LVTs and mechanically prepare and clean the subfloor. Where subfloor relative humidity (RH) levels are above 75% (65% where wood floorcoverings will be installed), a waterproof surface membrane should be installed to stop excess subfloor moisture rising up to the level of floorcoverings and potentially causing complete floor failure. ![]() This is very likely a result of residual construction moisture. After less than a year, the floor has failed. I’ve installed LVTs in a new conservatory. Ball’s technical team in the past few weeks. We've picked some of the most frequently-asked questions from the hundreds answered by F.
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