Soft, spongy or sagging spots in a mobile home floor are rarely a problem with the surface you walk on. The damage is almost always in the particleboard subfloor underneath, and unless that layer is replaced and the moisture source is stopped, the soft spot always comes back.
What's included
- Soft spot elimination
- Rotted subfloor replacement
- Moisture source addressed
- Solid, level finish
Signs you may need this
- Soft or spongy spots underfoot, often near water
- Floors that flex, bounce or feel weak
- Visible sagging or dips across a room
- Musty smell or discoloration on the flooring
What causes a soft subfloor
Most manufactured homes were built with a pressed particleboard subfloor that is strong when dry but crumbles once it gets wet. Slow plumbing leaks, a failing toilet seal, condensation, or a torn underbelly let moisture reach that layer, and the particleboard swells and loses its strength.
That is why soft spots tend to appear in the same places: in front of the sink, around the toilet and tub, near exterior doors and by the water heater.
A repair that actually lasts
Screwing plywood over a soft area only hides the problem while the damaged decking keeps breaking down. We cut the failed subfloor back to solid material, stop the moisture source, reinforce the framing, and install new moisture-resistant decking so the floor is solid for good.
- Locate and stop the moisture source
- Remove failed particleboard back to sound material
- Inspect and reinforce joists and framing
- Install new moisture-resistant subfloor and reseal from below
Related reading
How to Repair a Soft or Sagging Floor in a Mobile HomeNeed subfloor repair in Greater Sacramento?
We specialize in mobile and manufactured homes and diagnose the real cause before any work begins. Get a free, no-pressure estimate.
Related Subfloor Repair Reading
How to Repair a Soft or Sagging Floor in a Mobile Home
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