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When your floors are sagging or bouncy, the culprit is almost always found in the crawl space under your home and its foundation. Problems there cause the floor's support system to sag and weaken. The resulting floor issues are a nuisance, but they also make you wonder: how long will the floor be able to support the weight of everything on it.
How did this happen?
Improper column spacing
When a crawl space is built, block or brick (heck, even sometimes wood) columns are located throughout the crawl space to support the weight of the structure above. If those columns are spaced too far apart, the beam or girder can become overloaded and sag between the columns. When the girder sags, so does the floor above it.
Weakened floor joists and girders
Because crawl spaces are often unsealed from the earth, wood exposed to moisture and humidity begins to rot, get moldy and weaken. The weakened girders and floor joists are unable to continue supporting the weight above, and the floor above the crawl space becomes bouncy, soft and may begin to sag.
Existing column settlement
Weak soil can cause the existing columns in the crawl space to sink or settle, often creating a gap between the top of the column and the bottom of the girder it was supporting. Once the column settles, the girder sags and the floors above sag. It's a chain reaction.