Subfloor Preparation

New flooring can only be as flat, quiet and stable as the surface beneath it. Lunko Construction prepares subfloors across Huntsville and North Alabama so the floor going down can actually meet the tolerances its own manufacturer publishes.

Preparation begins with measurement rather than opinion. Once the old covering is off, a long straightedge is worked across the room in several directions to find high and low areas, and the results are compared against the flatness tolerance published for the selected flooring. Those tolerances exist for physical reasons: a floating plank floor spans dips instead of following them, which produces hollow spots, clicking and stress on the locking joints, and large-format tile shows an uneven substrate as lippage between tile edges that grout cannot disguise.

The inspection is systematic. We look at flatness across the room and at doorways, soft or spongy areas that move underfoot, loose or protruding fasteners, squeaks and where they originate, panel condition including delaminating plywood or crumbling particleboard, previous patching and added underlayment layers, moisture evidence such as staining or salt deposits on concrete, height differences into adjoining rooms, and the substrate type itself. Then we explain what we found in plain terms along with what the new flooring requires us to do about it.

Ordinary preparation work covers most subfloors. Loose panels are refastened into framing, protruding fasteners are driven or removed, and screws often replace nails that have worked loose, which is the most cost-effective step available for reducing noise. Local dips and voids are patched with an appropriate compound and feathered so the repair does not create a new hump at its edge, and high spots or adhesive ridges are ground down. Where low areas are broad rather than local, a cement-based leveling or underlayment compound can bring a whole area within tolerance, with priming, containment and product selection matched to both the substrate and the flooring going over it. Some assemblies also call for an added underlayment panel or membrane for smoothness, sound or crack isolation under tile, chosen from the product instructions rather than habit.

Moisture is reported as observation and testing, not as a guarantee. Concrete slabs release moisture and wood subfloors respond to conditions around and beneath them, so we look for staining, dampness and salt deposits, and where the flooring manufacturer requires it, moisture testing is performed before installation proceeds. We report what we see and what testing shows at that time. We cannot certify a home dry against future conditions, and where the evidence points to an ongoing source rather than a past event, the honest recommendation is to identify and address that source before a new floor covers it.

Height transitions are settled while the subfloor is still exposed. Added underlayment, leveling compound or a thicker flooring product changes finished height, which affects where the new floor meets tile, carpet or an exterior threshold, whether door bottoms need trimming and whether appliance and cabinet clearances still work. Planning that before ordering avoids finishing a beautiful floor that can only be reached by a step nobody intended.

Request a consultation or call (256) 795-3451.