Key takeaways
- Moisture softens joists and subfloor
- Piers and posts can settle or tilt
- Notched or cracked joists lose strength
- A careful inspection finds the cause
A sagging floor is a symptom. The cause lives below.
Common causes
- Damp or rotted joists and subfloor
- Settled, cracked or leaning piers
- An undersized or damaged beam
- Joists cut for pipes and ducts
What to check
Look for bounce, slopes and gaps at baseboards. From below, probe wood for softness and check that every post and pier is solid and in contact with the beam.
What to do
The fix depends on the cause. It may be sistering joists, replacing a beam, setting new posts or all three, along with fixing the moisture.
Related services
- Sagging Floor and Jack Post Support
- Floor Joist Sistering and Repair
- Support Beam and Girder Replacement
Questions about your own crawl space? Call or text 800-224-9245, or use the quote form below.