Flooring & Tile · Property Services

Subfloor Prep & Self-Leveling

Floors fail when the base is wrong: uneven spots show through, tile cracks and planks flex and separate. Preparing and leveling the subfloor gives the new surface a flat, strong foundation. NorTech connects you with vetted flooring pros who set their own price and measure flatness before and after.

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Why flat matters and how it is measured

Most flooring manufacturers require subfloors to be flat within a small tolerance, such as 3/16 inch in ten feet. Dips and humps cause hollow spots, squeaks and failed joints, and large format tile is especially unforgiving. A pro uses a straightedge or laser to find problem areas and marks them. They also test moisture, since damp slabs can ruin adhesives and wood. Fixing the base is inexpensive compared with redoing a new floor. Mark any squeaks, soft spots or stains you know about before the visit, because they point to causes that leveling compound alone will not fix.

Grinding, repairing and filling

High spots are ground down, cracks are patched and loose boards are fastened. Old adhesive, paint and sealers are removed so new material bonds. Low spots are filled with patching compound or self-leveling underlayment. Primer is applied to control suction and promote adhesion. Contractors protect doors, drains and vents from flowing material and plan the pour so it can spread before it sets. Ask which underlayment product will be used, its maximum thickness and its drying time, so the flooring installer can schedule the next step.

Pouring, curing and readiness

Self-leveling underlayment is mixed and poured, then spread with a gauge rake and smoothing tool. It flows into an even surface and sets in hours, though full cure times vary. Temperature and ventilation matter. Foot traffic is limited at first, and the flooring installer should confirm moisture and flatness before starting. Ask for the product data sheet, including maximum thickness and compatibility with your flooring. Keep the room closed and the temperature steady while the underlayment cures, since drafts and heat can cause cracking or uneven setting.

When to book subfloor prep & self-leveling

Your floor is uneven or has noticeable dips.

You are installing tile and need a flat base.

Old adhesive or paint must be removed.

You are covering a patched or repaired slab.

A floor squeaks or flexes.

The flooring manufacturer requires a flat surface for the warranty.

60-Day Warranty

Backed by your provider’s warranty. If covered work fails, your provider makes it right — free.

Frequently asked

Subfloor Prep & Self-Leveling — common questions

It is a cement-based or gypsum-based liquid that flows to a flat surface and hardens. It fills low spots and creates a smooth base for flooring. Mention any special conditions at your property so the plan fits them.

Many products can be walked on in a few hours, and flooring can start in one to several days. The product data sheet gives specific times. Your provider can explain how this applies to your property before you book.

It handles moderate variations, and larger problems may require grinding, framing changes or a different approach. Timing can vary with weather, access and permits, so ask for a realistic window.

Yes for slabs and below-grade floors. Moisture can ruin adhesives and wood, so testing protects the new floor. Mention any special conditions at your property so the plan fits them.

Not by itself. Squeaks come from loose subfloors and are fixed by fastening. A pro addresses these before leveling. Timing can vary with weather, access and permits, so ask for a realistic window.

The pro guarantees the preparation and leveling workmanship for 60 days, including cracking or delamination from application errors. Structural movement and moisture from other sources are not covered.

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