The Government of Western Australia has now issued a directive that moisture barrier on all projects with resilient flooring is required, and should to be factored in at the start of construction.
Australian standard AS1884-2012 Floor coverings—Resilient sheet and tiles—Installation practices 18.104.22.168 states, that before subfloor preparation is performed and a floor covering laid on a concrete subfloor the dryness of the concrete shall be determined as described in Appendix A APPENDIX A A3.1.2 Relative humidity in-situ probe test. Concrete subfloors shall be considered dry when measurements taken in accordance with ASTM F2170-17 do not exceed 75% relative humidity.
If Oxtek Australia X200 Densi-Proof has been applied to the concrete substrate at time of pour, no moisture testing is required, provided that a warranty certificate for the X200 Densi-Proof application can be supplied.
When the RH readings of an existing concrete substrate exceed AS 1884-2012, Polyflor Australia recommends Oxtek Australia X220 Moisture Fix®.
X220 Moisture-Fix®. It is a single pack ready to use (no mixing) deeply penetrating, safe, odourless easy to apply (simply pour & spread) liquid that allows early site access (foot traffic in one hour) and in most cases, ready to accept floor prep and coverings in 24 hours.