Is Your Concrete Floor Ready for Flooring? Ask for the Moisture Report
A concrete floor should not be cleared for moisture-sensitive flooring simply because it looks dry or has reached a scheduled installation date. Ask the flooring installer for the selected product system's moisture requirements, the testing plan, and written acceptance of the results. Make that decision a separate milestone from completing the concrete work.
A dry-looking surface is not the whole decision
The National Ready Mixed Concrete Association's CIP 28 explains that moisture in concrete can interfere with flooring and coating performance. It identifies residual water in the slab, moisture from below, and construction wetting as possible sources. Drying depends on the concrete and surrounding conditions; the calendar alone does not establish readiness.
For an owner renovating a Middle Tennessee shop, office, or interior workspace, the practical question is therefore not just when the flooring crew can arrive. It is what evidence that crew needs before accepting the substrate. Put that question on the project agenda while materials are being selected, rather than leaving it for delivery day.
Start with the actual flooring system
Create a short product record containing the flooring name, adhesive or coating system, and the current manufacturer instructions supplied by the installer. Ask the installer to identify the applicable moisture test and acceptance criteria for that combination. Do not let a generic statement such as suitable for concrete stand in for a project-specific answer.
If the product changes during purchasing, send the replacement information back for review. Treat a change in adhesive or coating as a reason to reconfirm the acceptance plan, even when the visible finish stays the same. Keep the approved product record with the proposal so purchasing, field supervision, and ownership are working from the same selection.
Make the test report traceable to the rooms
CIP 28 distinguishes quantitative moisture testing from qualitative checks and notes that a negative plastic-sheet observation does not establish that the slab is acceptably dry below its surface. Have the installer or testing professional select and interpret the appropriate procedure under current product requirements. A casual visual check is not the report to request.
Ask for a dated report that identifies the test method, test locations, results, and relevant building conditions. Request a marked floor plan so that a result can be connected to the room where flooring is proposed. If the work is phased, ask which areas the acceptance covers and which remain undecided. These are document requests for the project team, not instructions for owners to drill or test slabs themselves.
Give the team the slab history you actually have
Gather available drawings, previous flooring records, known leak history, and notes about recent wet work. Label missing information as unknown. NRMCA's CIP 29 describes an under-slab vapor retarder as a way to limit moisture transmission from below; its presence does not eliminate moisture already in the concrete or later wetting from above.
Ask the team whether uncertainty about the existing slab requires more investigation before committing to the proposed flooring. Avoid turning an absent drawing into a confident claim that a membrane either exists or is missing. For a renovation, a simple folder separating confirmed records from owner recollections can make the handoff discussion much clearer.
Decide who handles a result that delays installation
Before scheduling the final installation, name the person who receives the report and the person authorized to approve the next step. Ask how additional evaluation, retesting, a revised product selection, or proposed moisture treatment would be priced and approved. Request written manufacturer compatibility confirmation for any proposed treatment rather than assuming one product solves every condition.
Keep the installation date provisional until the responsible team accepts the evidence. For occupied premises, identify who will notify staff, move stored items, and update room availability if the date changes. Milliken lists floor slabs among its concrete services. When discussing concrete work with Milliken, explain the planned floor finish and ask where its scope ends and the flooring contractor's acceptance responsibilities begin.
Frequently asked questions
Should I request one universal moisture limit?
No. Ask for the acceptance criteria and test method tied to the selected flooring, adhesive, or coating system. Have the responsible installer document which requirements govern your project.
Who should keep the moisture report?
Ask for copies for the owner and the installation team. Store the report with the approved product information, location plan, and written installation decision so the record remains understandable after the project ends.
Does this article provide a slab-testing procedure?
No. It is a handoff checklist for owners. Test selection, execution, interpretation, and any corrective system belong with the responsible professionals and current manufacturer instructions.