Why do I check moisture before installing a floor?

A surface can look dry while moisture remains within the base or arrives from another part of the building. I therefore treat moisture assessment as part of deciding whether a floor is ready to cover. New boards should not become the way we discover that an old leak or damp area is still active.

The checks depend on the construction. A concrete slab and a suspended timber floor need different consideration, and the test method must suit the material. I look for information about recent building work, leaks, ventilation and previous floor damage, then compare the findings with the proposed flooring and installation products.

A moisture-control layer can form part of an approved system, but it has limits. It is not the same as making a room waterproof, and it should not be used to avoid investigating ongoing water entry. The flooring, barrier, adhesive and preparation materials need to work together rather than be chosen independently.

I also avoid promising that a floor will be ready after a fixed number of days. Weather, the building and the condition of the base can affect the decision. Where further drying or another trade's repair is needed, we should plan for that before materials are fitted or furniture is moved back.

Tell me if the property has had a roof, plumbing or dishwasher leak, or if there are damp smells or changes near external walls. Photos and a timeline are helpful, even when the visible marks have disappeared. This information lets me focus the inspection and explain the next step without guessing from the surface alone.