Old houses possess a charm and character that newer homes often lack, with their unique architecture and rich history. However, along with their timeless appeal, they can sometimes present unique challenges, and one of the most common is uneven floors. While a slight slope might add to the house's quaintness, significant unevenness can be more than just an aesthetic issue; it can pose safety hazards and complicate future flooring installations. As your trusted local flooring company and home remodeling experts, we're here to guide you through understanding and addressing uneven floors in your beloved old home.

Why do old house floors become uneven?

Uneven floors in older homes are rarely a mystery; they're usually a symptom of age and the natural settling process. Several factors can contribute to this common issue:

Settling of the foundation: Over decades, a house's foundation can settle unevenly, leading to dips or slopes in the flooring above. This is often the most significant cause of widespread unevenness.
Structural issues: Damaged or weakened floor joists, sills, or support beams due to moisture, rot, or insect damage can cause floors to sag.
Original construction imperfections: Building practices of yesteryear sometimes allowed for less precision than today's standards. Floors might have been slightly uneven from day one.
Water damage: Leaks from plumbing, roofs, or foundations can weaken wooden subflooring and joists, leading to soft, sagging spots.
Inadequate support: In some cases, the original design might not have included enough support for the spans, causing natural sagging over time.
Remodeling impacts: Previous renovations, especially those involving heavy additions or alterations without proper structural consideration, can also contribute to unevenness.

Assessing the severity of unevenness

Before jumping into solutions, it's crucial to assess the extent and cause of your floor's unevenness. Small dips or humps are common, but significant slopes or bouncy areas might indicate a more serious structural problem.

Start by clearing the area. Use a long, straight edge (like a 6-foot level or a piece of straight lumber) and place it across various parts of the floor. Look for gaps underneath to identify low spots and rock it to find high spots. A rolling ball test can also quickly reveal slopes. Pay attention to areas near walls, doorways, and load-bearing points. If you notice large areas of significant slope (more than an inch over several feet) or significant bouncing, it’s a good indicator that professional assessment, potentially from a structural engineer, might be needed.

Tools and materials you might need

Depending on the method you choose, you might need:

A long level or straightedge
Shims (wood or composite)
Self-leveling underlayment compound (cementitious or gypsum-based)
Primer for self-leveling compound
Plywood or oriented strand board (OSB) in various thicknesses
Screws and a drill
Floor scraper or grinder (for high spots)
Trowel or squeegee
Mixing bucket and paddle mixer
Measuring tape
Safety gear (gloves, eye protection, respirator)

Solutions for minor unevenness

For smaller dips, humps, or general wavy floors, there are several effective strategies.

Shimming floor joists or subfloor: If the unevenness is localized to a few joists or a specific area of the subfloor, shims can be installed on top of the joists before the new subfloor or underlayment is laid. This method works well for bringing specific areas up to level. Carefully measure the gap under your straightedge and cut or stack shims to fill it.
Using self-leveling compound: This is a popular solution for achieving a smooth, flat surface over a wide area with minor to moderate depressions. Self-leveling compounds are flowable mixtures that spread out and seek their own level. After preparing the subfloor (cleaning, priming, and sealing any gaps), the compound is poured and spread, creating a perfectly flat plane once dry. This is an excellent option for preparing a floor for tile, luxury vinyl plank, or engineered wood.
Adding plywood underlayment: For floors with slight, gradual variations, adding a new layer of plywood underlayment can help bridge minor gaps and create a more uniform surface. Thicker plywood can help minimize the perception of existing unevenness. In some cases, strategic shimming under this new layer of plywood can also be employed.

Addressing significant unevenness (when to call the experts)

While DIY methods are suitable for minor issues, some situations demand the knowledge and experience of a professional. If your assessment reveals:

Severe structural sagging: This can indicate issues with load-bearing walls, main support beams, or significant joist damage.
Bouncy or spongy floors: Beyond normal give, excessive bounce often points to weakened or undersized joists.
Visible foundation cracks or shifting: These are clear signs of a deeper structural problem that needs immediate expert attention.
Widespread, significant slopes: If the entire house seems to be sloping in one direction, it's a sign of foundation settlement that requires a structural engineer's assessment and specialized repair.

As flooring experts and home remodeling specialists, we understand that structural issues are beyond a simple flooring fix. We can help assess the situation and, if necessary, recommend reputable structural engineers or foundation repair specialists in the Broken Arrow, South Tulsa, and wider Tulsa Metro areas who can address the root cause before we proceed with the flooring restoration.

The process of leveling an uneven floor

Regardless of the method, the general steps for leveling an uneven floor typically involve:

Preparation: Remove all existing flooring down to the subfloor. Thoroughly clean the subfloor, removing any nails, staples, debris, and loose material. Repair any damaged or rotting sections of the subfloor.
Assessment and marking: Use your long straightedge and level to identify and mark all high and low spots. This will guide your leveling efforts.
Addressing high spots: For small humps, you might be able to sand or grind them down. For larger, structural high spots, professional intervention may be required.
Applying the chosen leveling method: This is where you’d use shims, self-leveling compound, or strategic plywood layering to build up the low areas.
Drying and curing: Allow adequate time for any compounds or adhesives to dry and cure completely according to manufacturer instructions. This is crucial for long-term stability.
Final inspection: Before installing your new flooring, do one last check with your straightedge to ensure the floor is now as level and flat as possible.
New flooring installation: With a perfectly level subfloor, your new flooring — whether it's beautiful hardwood, durable tile, or elegant luxury vinyl — will install flawlessly and look stunning.

Choosing the right new flooring

Once your old house's floors are leveled, you have a vast array of flooring options. Consider materials that complement the home's age and style, while also meeting your family's lifestyle needs. Hardwood, engineered wood, luxury vinyl planks (LVP), and even tile are all excellent choices for a newly leveled floor, offering durability and timeless appeal. Our team can help you navigate these options to find the perfect fit for your home.

BA Flooring And Design: Your trusted community partner for beautiful, level floors

Fixing uneven floors in an old house is a significant undertaking, but it's an investment that pays off in safety, aesthetics, and the longevity of your new flooring. It restores the integrity and beauty of your home, making it a more comfortable and enjoyable living space.

If you're dealing with uneven floors in your old house, or if you're ready to transform your living space with expert home remodeling, the BA Flooring Team is here to help. As your trusted local flooring company, we service Broken Arrow, South Tulsa, Tulsa, Grove, Afton, Vinita, and Bixby, OK. We are customer-focused, love helping people love where they live, and will listen to your ideas and goals to put together a game plan that meets your family's lifestyle and budget. Let our flooring experts guide you to a perfectly level and beautifully finished floor.

Call BA Flooring and Design today for a consultation.

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Fixing Uneven Floors in an Old House: A Complete Guide