Sagging or uneven floors are a warning sign that you have structural problems beneath your feet. Wavy hardwood floors, squeaky sounds under the carpet when walking, or just complete bowing across an entire room. Do not dismiss this as unsightly or simply an annoyance, these are warning signs that the structural integrity of the foundation and support columns below have been compromised and is in need of repairs. Home’s can lose significant value at the time of resale if found to have structural foundation issues.
What is causing your floors to sag and become uneven? Simply put, the soil your foundation was built on isn’t stable and likely the support columns and floor joist’s are poorly designed and improperly spaced. Another factor is moisture levels in an unfinished crawl space which degrade the wood over time causing it to weaken, deform and sometimes fail.
Depending on the amount of clay, sand, and organic matter in your soil, it’s unique geologic composition can present a variety of problematic reactions to an extended period of wet, dry, hot or cold conditions. When soil stays too dry, it shrinks and creates voids where a foundation will settle. When soil stays too wet, it gets soft and cannot bear the heavy loads and a foundation will sink. When soil freezes, it will expand and heave the foundation upwards. All of these soil conditions put pressure on a foundation which then causes damage to it and the structure above.