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With direct adhesion, it is critically important to assess the condition of the subfloor before measuring moisture or other process steps. The contractor needs to look at the structural suitability of the sub floor, the surface hardness and obvious contamination. As an example, any hollow spots would suggest a structural issue. Excessive crumbling on the surface would suggest a hardness issue. Surface staining, plaster residue or discoloration would suggest a contaminate issue. Most problems can be dealt with, but are site specific. Please call us for advice if you have questions at this stage.
The best advice for all calcium sulphate based floors is to remove the surface latents (according to manufacturer’s recommendations) and then take a moisture reading. Industry practice would suggest this is best done with a sealed Hygrometer over a period of at least 48 hours. In this case we would advise that British Standard (65%RH or less) be achieved before caring on with any work.