Sub-Floor Repair in Grayson County

Soft spots under your carpet, floors that bounce when you walk, squeaks that weren’t there two years ago — these are the early warnings of sub-floor and sub-structure damage. In Grayson County’s mix of older homes, crawl space foundations, and high seasonal humidity, this is one of the most common repair calls we get.

What Causes Sub-Floor Damage?

• Crawl space moisture — Poor vapor barriers or grading that directs rainwater toward the foundation lets ground moisture saturate joists and decking over years.
• Plumbing leaks — A slow drip under a bathroom can destroy several square feet of sub-floor before it becomes visible from above.
• Termite or pest damage — Hollow-sounding joists with no visible rot are often bug damage, common in older homes.
• Age and overspan — Older homes often used smaller joist dimensions than today’s code requires.

How We Diagnose It

The assessment starts from below — in the crawl space. We look at moisture levels, vapor barrier condition, and joist condition across the entire span. A moisture meter tells us whether wood is actively wet or was wet historically.

Repair Options

Sistering: A new full-length joist is bolted alongside the damaged one, transferring load to new wood. Cost-effective and structurally sound.

Full joist replacement: When a joist is too far gone to sister effectively, it’s removed and replaced.

Sub-floor decking replacement: If the OSB or plywood decking has delaminated or rotted, it gets cut out and replaced in sections.

Crawl space encapsulation: If moisture is the root cause, repairs without fixing the source just delay the next failure.

Timeline and Cost

A typical partial repair takes 1–2 days. A whole-house job can run 3–5 days. Costs vary significantly based on access and scope — a free on-site estimate is the only reliable way to give accurate numbers.

Learn more about our sub-floor repair services, then contact UIR for a free on-site assessment. We serve Clarkson, Leitchfield, Caneyville, and all of Grayson County.