Subfloor Repair & Leveling in Rochester

Why subfloor problems get blamed on the flooring

Most "bad hardwood install" complaints we get called out to inspect turn out to be subfloor problems that show up after the new floor is down — cupping, squeaking, or a soft spot that wasn't there at the first walkthrough. The flooring material is rarely the cause. Rochester's older housing stock (1920s–1960s) was framed to the standards of its era, and 60–100 years of settling, moisture cycling, and prior renovations routinely leave joists that have lost crown, subfloor panels that were never properly fastened, or additions where the new framing doesn't tie into the original at a consistent height. We measure flatness with a 10-foot straightedge before quoting any install or refinish — the manufacturer spec for engineered and solid hardwood is 3/16 inch of variance over 10 feet, and most subfloor failures we find are outside that spec by a wide margin.

Squeaks are almost always a subfloor-to-joist fastening problem, not a flooring problem — the panel has separated slightly from the joist and rubs when weight shifts across it. From above, we can often screw the subfloor back down through the finish floor at the joist location without opening the ceiling below, which is a same-day fix on most jobs. From below, if there's open access (an unfinished basement or crawl space), we can add construction adhesive and screws for a more permanent repair. Diagnosing which approach applies takes a walk-test with the homeowner pointing out where the noise happens, followed by a joist-location check.

Joist sistering — fastening a new joist alongside a sagging or undersized original — comes up most often in additions and finished basements where the original framing wasn't sized for the new load, or in older homes where a joist has developed a permanent sag from decades of point loads (a heavy piano, an old waterbed, a poorly distributed renovation load). We measure deflection under load before recommending sistering; not every dip in a floor needs structural correction, and we won't sell a sistering job on a subfloor that just needs leveling compound. The two repairs solve different problems and cost differently, and mixing them up is the most common overcharge we see on other contractors' quotes.

This is a dry-cause service — squeaks, sag, age, and undersized framing. If your subfloor problem started with visible water (a burst pipe, an ice dam, a failed appliance line), see water damage floor repair or ice-dam and water-damage subfloor repair instead — those follow a moisture-drying protocol before any structural work starts, which this service doesn't include.