During which phase of construction are moisture tests on slabs most relevant?

Moisture tests on slabs are most relevant before flooring installation because the flooring material can be significantly affected by the moisture content in the concrete slab. High moisture levels can lead to various issues such as mold growth, warping, and adhesion failure of flooring materials.

By conducting moisture tests at this stage, contractors can ensure that the slab is properly dried and ready to support the selected flooring, which helps prevent future complications and ensures the longevity and performance of the flooring. This proactive measure is crucial, especially for sensitive flooring types such as hardwood, laminate, and certain types of adhesives, which can be damaged by excessive moisture.

Other phases such as wallpapering, painting, and plumbing are not directly impacted by the moisture level in the slab in the same way that flooring installation is. Therefore, the most appropriate time for moisture testing is indeed before flooring installation.