The subfloor is the floor under your floor — plywood, OSB, or old plank over joists — and every squeak, bounce, dip, and soft spot upstairs starts there. Subfloor repair replaces rot, flattens humps and dips, screws down movement, and gives the finish floor something worth fastening to. Call (866) 849-1030 — the referral is free and the licensed pro sets the price.
How does subfloor repair actually work?
Diagnosis first: pros walk the floor for deflection, probe soft spots, meter for moisture, and where needed look from below (basement or crawlspace) at joists and sheathing. The repair menu runs from screwing squeaks and sistering a weakened joist to cutting out rot back to solid framing and sheeting in new material — with the moisture source fixed first, or the repair is a countdown.
Flattening is its own craft: self-leveling compound for dips, grinding for humps, shimming over joists. Modern floating floors have tight flatness specs, and 'the installer said the subfloor was fine' is doing a lot of work in most flooring failure stories.
When do you need it — and when don't you?
Repair before any new floor when you feel bounce or hear squeaks, after any leak or flood, when tile is planned (deflection spec), and always in older homes where plank subfloors have a century of settling. The cheapest time to fix a subfloor is the week the old floor is already out.
Three ways this job goes wrong (and how pros prevent it)
Covering rot
New flooring over soft OSB fails from below on its own schedule. Rot never improves under there.
Leveling over movement
Self-leveler poured on a bouncing subfloor cracks and powders. Stiffen first, flatten second.
Missing the moisture source
Replacing wet subfloor without fixing the leak, grade, or crawlspace humidity that soaked it books the same repair again in two years.
Call sooner rather than later if…
- Soft spot spreading near a bathroom — active leak until proven otherwise
- Floor sagging toward a beam line — structural look before cosmetic work
- Install crew found bad subfloor — same-week repair keeps the project alive
How the free referral works
Call and describe the job — new installation, refinishing, repair, or tear-out — and your ZIP code.
Your call is routed to a licensed, insured flooring professional who actually covers your neighborhood.
The pro inspects, measures, and prices the work. We never set or mark up prices — the referral costs you nothing.
Subfloor Repair: your questions, answered honestly
How do I know if my subfloor is bad?
Bounce when you walk, squeaks that move around, dips visible along a wall line, tile grout cracking in lines, or a floor vent showing delaminated plies. Any of those earns a professional look — most turn out fixable for far less than fear suggests.
Plywood vs. OSB — does it matter?
Both work dry; both fail wet. OSB swells at edges when soaked and holds moisture longer; plywood delaminates. The repair conversation is really a moisture conversation — the sheet goods are interchangeable when the water is handled.
Can a subfloor be fixed without removing the floor?
Squeaks often can — screws from below, or specialized fasteners through carpet. Rot, dips, and structural issues can't: the flooring above comes up. That's why smart money bundles subfloor work with planned floor replacement.
Is subfloor repair a structural job?
Sheathing repairs, no — standard trade work. Joist repairs, sistering, and beam issues cross into structural territory where permits and sometimes an engineer's letter apply. A licensed pro knows where that line sits in your jurisdiction and says so.
How do I find subfloor repair near me?
Call (866) 849-1030 — FloorRelay connects you free with a licensed, insured pro who handles subfloor repair in your ZIP code. One call, no web forms, and your number is never resold to a list of contractors.
How much does subfloor repair cost?
Honest answer: it depends on your rooms, and nobody pricing it sight-unseen is doing you a favor. Square footage, material grade, subfloor condition, tear-out, and local labor rates all move the number. The licensed pro measures and quotes the real figure — the referral itself is free, and there's no obligation.
Is cheap subfloor repair worth the risk?
The lowest bid is usually low because something was left out — prep, moisture testing, disposal, or trim. Those omissions surface later as failures that cost more than the difference. A fair quote itemizes every step; make the bids show their work before comparing bottom lines.
Are the pros licensed and insured?
Yes — routing your call to licensed, insured flooring professionals is the entire FloorRelay service. Verify the credential when the pro quotes your job, too; the legitimate ones expect the question and answer it happily.
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Talk to a licensed pro about subfloor repair
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