Do not confuse a clean area for a damp area. Duct tape will remove surface dusting and appear lighter, making the area under the membrane appear darker by comparison. Upon removal, there should be no visible condensation, dampness, discoloration or an odor of dampness from the slab under the test membrane areas. The presence of the membrane will protect that area from dust and dirt and appear darker. The general contractor, foreman, or technician on the project must certify results and initial EACH space provided for each test membrane.
Hash marks are acceptable for repetitive results.
Temperature and humidity MUST be recorded.