A floor that dips toward the middle of a room, bounces when you walk across it, or lets doors swing shut on their own usually has a problem in the crawl space below. In older Tulsa homes, common causes are joists that span too far without support, wood piers or shims that have rotted or crushed, beams that have sagged over decades, and framing weakened by years of crawl space moisture.
Clay soil adds to it. Tulsa area clay swells when it is wet and shrinks during dry spells, and piers sitting on small footings can settle unevenly as the soil moves. A wet crawl space also softens the soil under footings and leads to rot where wood touches the ground.
Most sagging floors can be repaired from the crawl space without tearing up the floor. We find the cause, explains whether it is a framing, support or foundation issue, and quotes the repair in writing.
Tulsa tip: fix the moisture with the framing
If joists sagged because they rotted or stayed damp, new posts alone will not hold. Ask whether the plan includes a vapor barrier or encapsulation so the new and existing wood stays dry. Otherwise the same problem returns.
Signs You Need Sagging Floor and Floor Joist Repair
- Floors that slope or dip toward one area
- Bouncy or springy spots when you walk
- Doors that stick or swing on their own
- Gaps between the floor and baseboards
- Cracks in drywall above interior doors
- Tile or grout cracking in kitchens and baths
Choosing the Right Sagging Floor Repair
The fix depends on what failed. When a beam or girder sags between widely spaced piers, adding adjustable steel support posts on proper footings shortens the span and lifts the beam back up. We raise the floor gradually, often over days or weeks, so drywall and trim are not cracked by a sudden lift. Posts should sit on a concrete footing or engineered base, not on a loose block on dirt.
When individual joists are cracked, notched, rotted or undersized, sistering is the usual repair: a new full-length joist is fastened alongside the old one with structural screws or bolts and construction adhesive. Badly rotted beams or sill plates may need to be replaced in sections. If walls are cracking and the foundation itself is moving, a foundation repair specialist may need to evaluate piers or footings. Moisture control, such as a vapor barrier or encapsulation, protects the repair.
Sagging Floor and Floor Joist Repair Services We Help With
Adjustable steel support posts
Posts on concrete footings that support beams and shorten long spans.
Floor joist sistering
New joists fastened alongside damaged or undersized ones.
Beam and girder repair
Reinforcing or replacing sagging and rotted beams in sections.
Sill plate and rim repair
Replacing rotted wood where the house sits on the foundation.
Pier and shim corrections
Replacing crushed wood shims and failed piers.
Gradual floor leveling
Lifting floors slowly to reduce cracking in finishes above.
Sagging Floor and Floor Joist Repair Cost in Tulsa, OK
| Project | Typical Range | What Affects It |
|---|---|---|
| Adjustable steel support post | $300 to $900 each | Footing, height, access |
| Typical support post project | $2,000 to $6,000 | Number of posts, beam work |
| Sistering a floor joist | $300 to $900 each | Length, plumbing and ducts in the way |
| Beam or girder section replacement | $2,500 to $8,000 | Length, load, temporary shoring |
| Sill plate repair | $100 to $300 per linear ft | Rot extent, access from inside or out |
| Typical sagging floor repair overall | $2,000 to $8,000 | Cause and amount of framing work |
How It Works
- 1
Measure and inspect
We measure the floor slope, inspect framing, piers and footings, and check moisture.
- 2
Repair plan
You get a written plan showing where posts, sistered joists or beam repairs go and why.
- 3
Support and reinforce
Footings and posts are installed, joists sistered and damaged wood replaced.
- 4
Level and protect
Floors are raised gradually and moisture control is added so the repair lasts.