Short answer
A soft floor in a Greensboro house usually means water has reached the plywood or joists, most often around a toilet, tub or dishwasher. Right now, close the fixture's shutoff valve and keep weight off the spot. We find the source from the crawl space, then replace what has rotted.
Signs it is time to call
- Floor flexes underfootA spot that gives near a fixture has wet plywood.
- Toilet rocksThe flange or floor under it is no longer solid.
- Cracked tile or grout linesTile cracks when the floor beneath it moves.
- Ceiling stain below a bathA brown ring points to a leak above.
How we run the job, step by step
- Stop the sourceShut the fixture's supply.
- Inspect from belowStained wood, joists and sill are checked.
- Open the floorRotted panels are cut out between joists.
- Repair framing, lay subfloorSister joists, then glue and screw new panels.
- Reset and finishFixtures go back on solid wood.
Most soft floors started small: a wax ring that let go, a slow tub drain drip, a dishwasher hose weeping under the cabinet. Each use puts more water into the wood. New flooring laid over a soft area traps that moisture without fixing it, and fails along with the old subfloor.
We start underneath when there is a crawl space, because the extent shows there: stained plywood, darkened joist tops, a damp sill plate. From above, we pull the finish floor back to sound subfloor, cut out the rot between joists, repair the framing, and glue and screw down new tongue-and-groove panels.
Soft spots by the sink, dishwasher or vanity
A spongy feel in front of the sink or vanity usually traces to a supply line, drain joint or dishwasher leaking under the cabinet where nobody looks. Vinyl and tile hide it until the floor flexes or grout cracks in a line. We pull the toe kick or the cabinet, find the wet edge of the damage, and replace subfloor out to solid wood. Angi's national data puts subfloor replacement at $3 to $10 per square foot, or $900 to $3,000 for a 300 square foot room.
Floors that sag toward the middle of the room
A floor that dips across a room, doors that drift shut, or a marble that always rolls one way can point to framing trouble rather than a single wet spot. Joists may have rotted at the sill, been notched for old plumbing, or been undersized from the start. We crawl the house, measure how far the floor has dropped, and check the girder, piers and sill before recommending a fix, whether a new support line or new framing at the perimeter.
Sistering a cracked, notched or rotted joist
Sistering fastens a new full-depth joist alongside a damaged one so the pair carries the load. It suits a joist cut for a drain, cracked at a knot, or softened along part of its length while still bearing on solid wood at both ends. We jack the old joist toward level gradually, glue and bolt the new one to it, and add blocking. A rotted bearing end needs more than a sister. Angi lists floor structure rot repair at $15 to $40 per square foot nationally.
Rot around the toilet flange and tub drain
A rocking toilet, a ceiling stain below a bathroom, or tile cracked in a ring around the bowl usually means the wax seal or flange failed. Tubs leak at the overflow and drain, and water travels along the subfloor out of sight. We pull the toilet or tub apron, cut out the rot, set a new flange on solid wood, and reinstall the fixture on a flat, stiff floor. Fixr's Greensboro bathroom guide sets aside about $2,928 for hidden water damage found in a bath remodel.
Remodeling this in Greensboro houses
Many soft floors around Greensboro sit over a vented crawl space, which affects how long a repair lasts. In a 2002 Advanced Energy field study of 12 North Carolina houses, encapsulated crawl spaces stayed below 60 percent relative humidity all summer, while vented ones tracked humid outdoor air. When rot outruns the leak, we note the crawl space on the scope.
What a subfloor repair should include on the written scope
- Crawl space check of the area and sill plate
- Finding and stopping the water source
- Cutting rotted subfloor out between joists
- Sistering or replacing damaged joists
- Glued and screwed tongue-and-groove subfloor
- Fixtures reset on solid framing
What moves the price of subfloor repair
Our sources hold no Greensboro subfloor figure, so Angi's national numbers are the closest guide. Framing damage sets the price.
- Finish floor on top Sheet vinyl lifts quickly; tile takes longer.
- Framing damage Plywood alone costs less than sistering joists.
- Crawl space access Low clearance or ductwork slows work underneath.
- Fixtures to reset A toilet, tub or vanity has to come out and go back.
| What the figure covers | Published range | Source |
|---|---|---|
| Subfloor replacement, 300 sq ft room | $900 to $3,000 | How Much Does Subfloor Replacement Cost? - Angi |
| Floor structure rot repair | $15 to $40 per sq ft | How Much Does Dry Rot Repair Cost? - Angi |
| Hidden water damage in a Greensboro bath remodel | about $2,928 | Fixr - Greensboro NC bathroom remodel cost guide (Dan Simms) |
Published figures are averages from the sources named, not a quote. Your price comes after the walk-through.