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Unlike homes with basements or crawl spaces, a slab floor is solid concrete with no structural wood flooring system. For homes with this type of floor, soft soil or bad compaction is almost always the culprit. Once the soil is compromised, the slab will shift, and this creates the sagging or sinking effect. Pressure from that shift will sometimes crack the slab itself, causing high and low places in the flooring. To fix this type of damage, you need concrete slab repairs.
Water is a probable suspect, as it seeps into the ground around your foundation. The sill plate, wood beams, and floor joists are all vulnerable to this; these wooden components on top of your foundation are the wood framing system that supports your floor. Because it has direct contact with the concrete and can be over the exposed soil line, it often falls victim to water intrusion. Once water intrudes and saturates the wood, this leads to deterioration. It’s this deterioration that causes the floor system to fail.

But you don’t have to have standing water under your house to cause structural decay. High humidity can also damage the beams and joists that hold up your subfloor. Wood is highly porous and readily absorbs water from the air. Over time, this water saturation softens and rots the boards. As they decay, they compress under the weight of your home, lowering your floor sometimes by several inches.

Lack of building codes- or outdated ones- are another concern. A main support beam, the post that spans the length of your home, should be sized proportionately and supported every few feet. In many homes, the beams may not be the correct size or the support posts are installed too far apart. This over-spanning puts greater stress on the beam and makes it more likely to sag and potentially even fail.
Along the same lines, if your home is more than 50 years old, it’s also possible that inadequate materials are to blame. When a home is built, sometimes the beams or joists are not the correct dimensions. When this happens, a contractor will install a shim; a shim is a thin piece that adds a minimal lift to ‘even out’ the installation. Many times in construction, that shim was usually another piece of wood; at Acculevel we use steel shims to prevent compression or rot. These shims also allow us to increase the overall surface of the bearing load, so that the beam it’s supporting is not crushed by the weight of your home.
Technology is another age-related factor. New solutions and materials are always in development, but they take time to become commonplace. Before the 1970s, pretreated or pressure-treated lumber was not widely available or regularly used by builders. Lumber installed in its original ‘raw’ form is more vulnerable to insects and water damage.
New trends in home design can have a negative effect if a remodel doesn’t take the weight of the raw materials into account. Many older homes aren’t built to carry the load of solid granite countertops or stone-tiled floors and walls. Recreational items like a pool table or hot tub will also add significant weight to your floor system. These are all items that can put additional stress onto an already failing wood structure.
Contact Acculevel! We provide free estimates on sagging floor repairs.
We've completed a crucial foundation repair project for Angela in the 61607 area. The work involved fixing a cracked foundation and a bowing wall that had allowed water intrusion. Our team implemented a comprehensive waterproofing solution, including sealing cracks and ensuring a strong, durable foundation. This essential repair, valued at approximately $12,000, guarantees a secure and dry environment, eliminating previous mold and odor issues.
Near Peoria, IL
In zip code 61529, we successfully installed structural supports in Nick's basement to address sagging laminate flooring areas causing vinyl planking to split. This reinforcement ensures long-term stability and prevents further floor damage. The approximate cost for this essential repair was around $7,200, providing peace of mind for the homeowner.
Near Elmwood, IL
Addressed a significant issue in Loni's basement with a bowing wall in urgent need of repair. Our team implemented reinforcement solutions, stabilizing the wall to prevent further progression. The comprehensive service effectively enhances the structural integrity of the home, with a cost of around $25,000.
Near Hanna City, IL
We recently tackled a significant water intrusion problem in Jason's finished basement in zip code 61422. After noticing soaking in a 10x15 area near the sump pump, our team suspected a damaged sump pit and implemented comprehensive waterproofing solutions. The project involved sealing the walls, replacing damaged sump components, and installing a new interior drainage system to effectively channel water away from the foundation. This effort, priced around $4,700, aims to secure the basement environment against future moisture issues.
Near Bushnell, IL
Installed a comprehensive exterior drainage system to effectively channel water away from the property. This solution aims to prevent water intrusion and maintain a dry environment around the house, enhancing the overall waterproofing strategy.
Near Farmington, IL
Completed a crucial repair of two bowing basement walls for Dustin's property. The project involved stabilizing the wall structure to prevent future movement and potential damage. This targeted effort enhances the safety and longevity of the building’s foundation at a cost of around $6,550.
Near London Mills, IL


