Sagging, sloping, or bouncy floors are what happen when crawl space moisture is left alone long enough — the joists and beams rot and lose strength. Here is what structural repair and support jacks cost in the Hattiesburg area, how the fix works, and why it always comes back to moisture.
Crawl space structural repair in the Hattiesburg area typically runs about $1,000 to $5,000 or more. What moves the number:
A look under the house sets the real scope. Request a quote and describe where the floor sags or feels soft.
Support jacks — adjustable steel posts on proper footings — are set under the beams and joists to lift and stabilize a sagging floor and carry the load. Rotted or cracked joists are sistered with new lumber or replaced, and failing beams are reinforced. The result is a level, solid floor that stops flexing and bouncing. Because the damage came from moisture, a lasting repair pairs with sealing the space so the new wood stays dry.
In South Mississippi, the reason joists rot is a damp, unsealed crawl space — high humidity, ground moisture, and often standing water feeding wood-decay fungus that eats away at the framing. Fixing the sag without fixing the moisture just resets the clock. That is why structural repair goes hand in hand with a vapor barrier, drainage, and a dehumidifier — or full encapsulation — to protect the investment.
Usually $1,000 to $5,000 or more, depending on how many joists or beams are affected, support jacks needed, and how far rot has spread.
Usually joists or beams weakened by long-term crawl space moisture and rot, or settled and undersized supports.
Adjustable steel posts set under beams and joists to lift and stabilize a sagging floor and carry the load.
Not if the crawl space stays wet — a lasting repair also seals the space so the new lumber stays dry.
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Clears the fungus that rots joists.
Stops the moisture that caused the damage.
Seals the space to protect the repair.
You can also review drainage & sump pumps, dehumidifiers, and the areas we serve.