What to do if the wood flooring or laminate is to be installed on a wood or concrete subfloor

• Flatten the subfloor to NWFA or wood product manufacturer's printed instructions.
• Have a professional measure the concrete for flatness before subfloor panels are installed. This is money well spent that will save you a lot of misery should the flooring become loose and pop up.
• Have your wood flooring contractor or independent private wood flooring inspector perform Calcium Chloride Moisture tests before installing a wood subfloor over concrete. If moisture levels exceed the maximum limit determined by the wood flooring manufacturer, DO NOT proceed with the installation. Once the moisture level has been lowered to an acceptable range, install the subfloor.
• Make sure that each panel has the correct number of anchors to prevent movement, squeaking, swelling, buckling and raised floors after the installation.
• Moisture test each panel (6 tests per panel) before the panel is installed. If moisture content is not acceptable, do not install the panel.
• Once all subfloor panels are installed moisture test the entire subfloor again before any wood flooring or laminate product is installed. Do these test one-two days after the panels have been installed? If moisture content has increased, do not install wood flooring.
• Check for proper attachment to concrete and flatness across the subfloor before installing wood flooring or laminate products. Failure to do so could result in total replacement of the floor.