Weakened or Undersized Floor Joists
Most pier-and-beam homes in Huntsville were built with 2x8 or 2x10 joists at 16" spacing. After 30–60 years of moisture, load, and minor rot, those joists deflect more than they should. The floor sags between supports.
Sistering — bolting a new joist alongside the old one — restores stiffness without removing the floor above. It's a one-day job per affected room in most cases.
Crawl Space Moisture That Rots Wood
Huntsville's high humidity and seasonal rain saturate vented crawl spaces. Joists, beams, and subfloor absorb moisture, lose strength, and slowly rot from the bottom up.
Unencapsulated crawls in our area routinely run above 70% RH year-round — well past the threshold where wood begins to deteriorate. Encapsulation plus a crawl-space dehumidifier stops the cycle.
Settled or Rotted Support Beams and Piers
The wood girders running across your crawl space carry the floor joists. When the masonry piers under those girders settle, or the wood girders themselves rot, every floor above sinks with them.
We replace failed wood girders with engineered LVLs or steel beams and reset piers on solid bearing. That single change can lift visibly sagging floors back to level in a few days.
Foundation Settlement Under the Perimeter
Sometimes the sag isn't in the middle of the room — it's at the wall. That points to perimeter foundation settlement. The exterior wall has dropped, and the floor follows it down.
Steel push or helical piers driven to load-bearing strata stabilize the perimeter and, with hydraulic lift, often raise the wall back to its original elevation.
Termite or Water Damage You Can't See
Hidden termite tunnels, old plumbing leaks under sinks and tubs, and slow roof leaks dripping down framing all weaken structural wood without obvious surface damage. The first symptom is a sag.
We routinely find these during sagging-floor inspections. Repair includes replacing the damaged wood and addressing the moisture or pest source.
The Sagging Floor Repair Process
Inspection first — laser-level mapping of the floor, photo documentation of the crawl space, and a written report. Then a written estimate that lists every joist, beam, pier, and dehumidifier needed.
Most sagging-floor repairs take 1–3 days. Lifetime transferable warranty on structural work. No mess upstairs — almost everything is done from the crawl space.
Related Foundation Services
Frequently Asked Questions
Is a sagging floor dangerous?
Not usually in the short term, but it always indicates structural weakness that gets worse without repair. Severe sag (over 2" across a room) can compromise framing.
Can sagging floors be lifted back to level?
Yes. Hydraulic jacks plus permanent supports can lift most sagging floors back to within 1/4" of original. Severe rot may require joist replacement first.
Will fixing a sagging floor crack the walls above?
Done slowly and properly, no. We lift in small increments over days to let drywall, trim, and tile adjust without cracking.
How much does sagging floor repair cost in Huntsville?
Most repairs fall between $3,500 and $9,500 depending on the number of joists and supports involved. Severe rot or full beam replacement can run higher.
Is sagging caused by my crawl space encapsulation worth fixing first?
Yes — moisture is usually the root cause. We address moisture and structure together so the repair lasts.