Subfloor Repair

Subfloor Repair and Floor Leveling in Denton, TX

The subfloor is the structural layer beneath your finished floor: plywood, OSB, or wood planks fastened to the joists, or the concrete slab itself in many newer homes. When it is damaged, loose, or uneven, you feel it as squeaks, soft spots, dips, and tile or planks that crack and separate. At Smitty's Floor Covering, subfloor repair is part of our flooring services, and our crews correct squeaks, soft spots, and uneven areas before your new carpet, hardwood, laminate, luxury vinyl, or tile goes down.

New flooring cannot fix a failing subfloor. It only hides the problem until it telegraphs through the new surface. If you are planning new floors and something underfoot feels off, request a free flooring estimate and tell us what you have noticed.

Signs Your Subfloor Needs Repair

Most subfloor problems announce themselves long before they turn serious. Watch for these warning signs:

  • Squeaks and creaks: Loose panels rub against nails, screws, or joists as you walk across them.
  • Soft or spongy spots: A floor that gives underfoot often points to water damage, rot, or panels too thin for the span between joists.
  • Dips, humps, and slopes: High and low spots come from settling, sagging framing, or panels that have warped.
  • Cracked tile and grout: Tile needs a rigid base, and flex or pressure points underneath crack it.
  • Gaps and separating planks: Hardwood boards pull apart and click-lock joints in laminate or vinyl break when the floor below moves.
  • Stains, odors, or lifting: Discoloration, a musty smell, or flooring that cups or lifts near a toilet, tub, dishwasher, or water heater signals moisture below.

A single squeak may be a quick fix. A soft spot beside a toilet can mean rot that has spread under the surrounding floor. Either way, the time to find out is before new flooring goes down.

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Why the Subfloor Comes First

Repair the subfloor first, because every floor type depends on a flat, solid, dry base, and new flooring laid over a failing subfloor fails right along with it. Each material shows the problem differently:


  • Hardwood: Movement underneath causes squeaks and boards that separate.
  • Tile: The least forgiving floor of all; any flex or high spot can crack tile and grout.
  • Laminate and luxury vinyl: High and low spots stress the click-lock joints until they separate or sound hollow.
  • Carpet: The most forgiving floor; a good pad hides minor texture, but it cannot hide soft spots, squeaks, or real dips.

Our article on why floor leveling and a sound subfloor make floors last explains how skipping this step leads to gaps, creaks, and cracked tile down the road.

Floor Repair That Starts Underneath

If you are searching for floor repair, the fix you need may sit below the surface. Cracked tile, squeaky hardwood, separating laminate, and dips in carpet usually trace back to the subfloor, so replacing the top layer alone rarely solves them. When wall-to-wall carpet has simply loosened and rippled over the years, carpet re-stretch is often the answer. For most other floors, a lasting repair means taking up the damaged flooring, fixing the subfloor, and installing new flooring on a sound base.

Uneven Floors in Older Homes: Causes and Fixes

Uneven floors in an older house come from one of three places: the foundation, the framing, or the subfloor itself. A slight, even slope across a room is common in older homes and often harmless; a dip you can feel underfoot, or one that keeps getting worse, deserves a closer look. The right fix depends on the cause.


  • Foundation movement: North Texas clay soils swell when wet and shrink during drought, which shifts both the pier-and-beam foundations common in older homes and the slabs under newer ones. Cracks above doors and windows, sticking doors, and floors that slope toward exterior walls point here, and a foundation specialist or structural engineer should assess it before any flooring work begins.
  • Framing: Joists and beams weakened by old leaks, termites, or past renovations can sag and need structural repair.
  • The subfloor: Warped, delaminated, or rotted panels, or panels too thin for the joist span, create local dips, bounce, and squeaks. This is the layer subfloor repair addresses.

Common subfloor fixes include refastening loose panels to stop squeaks, cutting out and replacing damaged sections, adding a plywood overlay over rough areas, and filling low spots with patching or self-leveling compound. Our guide to diagnosing and fixing uneven floors in an older home covers the marble test, laser measurement, and the full range of repair options.

Concrete Slab Subfloors: Flatness and Moisture

In a slab home, the concrete is the subfloor, and it needs two things before new flooring goes down: a flat surface and moisture under control. Concrete wicks moisture up from the ground, so moisture testing before wood, laminate, or vinyl is standard practice, and a vapor barrier or moisture-rated underlayment is often part of the plan. Flatness comes from grinding down high spots and filling low spots and cracks with patching or self-leveling compound. Skip that prep and slab problems show up quickly: moisture can cup wood and break down adhesives, high spots make floating floors rock and click, and low spots leave hollow-sounding areas under vinyl and laminate. If you have your heart set on wood, our article on installing hardwood over concrete explains why engineered hardwood is the usual choice for slabs.

Water-Damaged Subfloors

Water is the most common reason a subfloor needs replacing rather than a quick fix. A slow leak from a toilet, dishwasher, water heater, or window lets moisture soak into plywood and OSB, which swell, delaminate, and eventually rot. Wood that stays soft after drying out has to be cut out and replaced, and the leak itself must be fixed first so the new subfloor stays dry. Old leak damage often hides under carpet pad or sheet vinyl until removal day, which is one more reason to plan for subfloor work from the start. In kitchens, baths, and laundry rooms, finishing the repair with waterproof luxury vinyl adds protection against the next spill.

How Our Subfloor Repair Process Works

Subfloor repair at Smitty's is part of a complete flooring project, handled by one team from the first measurement to installation day.


  • Measure and inspect: During your free in-home measurement, we measure each room and check the condition of your existing floor and subfloor, so repairs are planned before installation day.
  • Quote it up front: Any subfloor work is included in your quote along with removal and installation, so the scope is clear from the start.
  • Clear the room: We move furniture and take up and dispose of the old flooring, which is often when hidden damage comes to light.
  • Repair and level: Our crews correct squeaks, soft spots, and uneven areas so the new floor goes down on a solid, flat base.
  • Install: Your new floor is installed by our dedicated installation team on a base built to last.

What Affects the Cost of Subfloor Repair

Subfloor repair is priced by what the floor needs, and the full picture often appears only once the old flooring comes up. These factors matter most:


  • Extent of the damage: Refastening a few squeaky panels is a small job; replacing a water-damaged section or a whole room is a larger one.
  • The cause: Foundation or framing problems call for other specialists first and are priced separately.
  • Leveling needs: The size and depth of low spots decide how much patching or self-leveling compound the floor takes.
  • Old flooring removal: Tearing out tile takes more labor than pulling up carpet.
  • Your new floor: Tile and long planks demand flatter tolerances than carpet does.

Because subfloor work is part of your flooring project, our flooring financing can help you pay for the entire job over time.

Why Choose Smitty's for Subfloor Repair

Smitty's Floor Covering has been family owned since 1958 and is the oldest family-owned floor covering business in Denton County.


  • One accountable team: Furniture removal, old-floor removal and disposal, subfloor repair, installation, and aftercare all come from the same store.
  • Experience with older homes: Challenging flooring situations in older homes across Denton, Corinth, Hickory Creek, Krum, and Ponder are a specialty of ours.
  • A reputation you can check: See what our customers say about working with our family.
Subfloor Repair in Denton, TX from Smitty's Floor Covering

Visit Our Flooring Store Today

A beautiful floor starts with what you cannot see. Stop by our Denton showroom to talk through what you are noticing underfoot and choose the flooring that will go on top, or schedule your estimate and we will start with a close look at your subfloor. We proudly serve Denton, Corinth, Hickory Creek, Krum, Ponder, and the surrounding Denton County communities, and we would be glad to lay quality at your feet.

Request an estimate

Subfloor Repair FAQs

Subfloor repair fixes the structural layer under your floor so new flooring has a flat, solid base. Depending on the problem, that can mean refastening loose panels to stop squeaks, replacing water-damaged or rotted sections, or leveling high and low spots. It happens after the old floor comes up and before the new one goes down.


Start by finding the cause. Foundation movement needs a foundation specialist and sagging joists need structural repair; once the structure is sound, dips in the subfloor itself are corrected with patching or self-leveling compound, a plywood overlay, or replacement panels. Treating only the surface brings the problem back.


It should not. Squeaks, soft spots, and dips telegraph through new flooring, crack tile, and break the joints in laminate and luxury vinyl. Carpet pad can soften minor texture, but no floor covering fixes movement or rot.


No. The subfloor is the structural layer fastened to the joists or poured as a slab, while underlayment is a thin layer between the subfloor and your finished floor that adds cushion, sound control, and moisture protection. Our article on whether hardwood needs underlayment covers the options for wood floors.


Plan the heights at the subfloor. The lower floor can be built up with plywood or underlayment of the right thickness so both surfaces finish flush, and where a small difference remains, a transition strip made for height changes bridges it smoothly.



Look for soft or spongy spots, dark stains, a musty smell, and flooring that cups, lifts, or loosens near toilets, tubs, dishwashers, water heaters, or exterior doors. Cracked or loose bathroom tile is another warning sign. Any of these means the subfloor should be checked before new flooring is installed.


Yes. Subfloor repair is part of the flooring projects we handle from our Denton showroom for homes in Corinth, Hickory Creek, Krum, Ponder, and communities across Denton County, including Argyle, Aubrey, Flower Mound, Lake Dallas, and Lewisville.