Relative Humidity Testing (RH Testing)

Construction Testing Services is certified to provide RH Testing as outlined by ASTM F2170, “Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes.”

• Relative humidity (RH) testing measures the relative humidity that will exist in a concrete slab long after the floor is covered.
• A “relative” reading is necessary because the only way water vapor can evaporate is from a concrete slab’s surface.
• When a new slab dries, the moisture conditions in it change. This change leaves the highest amount of moisture in the deepest part of the slab, and the lowest amount at the surface, so the water vapor level (which is measured in terms of RH) will be higher at the bottom than at the surface.
• Excessive moisture permeating from floor slabs after installation can cause floor covering failures of various kinds.