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Flooring problems

Most flooring failures are moisture failures or prep failures, not product failures. Cupping, buckling, peaking laminate and lifting vinyl seams usually trace back to a subfloor that was too wet, a floor that wasn't acclimated, or expansion gaps that weren't left at the walls. Repairing a damaged subfloor in a 150-square-foot area runs about $250–$750, and replacing it runs roughly $3.50–$12 per square foot.

Cupping — board edges higher than the centers — means the underside of the floor is wetter than the top. The cause is under the floor: a damp crawlspace, a slab without a vapor barrier, or a leak. Sanding a cupped floor flat before the moisture is fixed and the wood has dried is the classic wasted repair. It will cup again, and now the boards are thinner.

Gaps between boards in winter and tightness in summer is normal seasonal movement in solid wood. Gaps you can drop a coin into, gaps that persist year-round, or boards that have pulled away from a wall are not normal — that is an acclimation or fastening problem.

Laminate and click-lock vinyl that peaks up in the middle of the room almost always means no expansion gap was left at the perimeter, or the flooring was pinned by a heavy cabinet, transition strip or nailed-down baseboard. The floor has nowhere to grow, so it grows upward. This is an installation defect, and it is worth pressing the installer on.

Squeaks are movement between the finish floor, the subfloor and the joists. From above, they are sometimes fixable with screws and shims; from an unfinished basement below, they are much easier. If the squeaking comes with visible bounce or sloping, stop treating it as a flooring issue — floor joist work runs about $125–$315 per joist and belongs to a structural contractor.

Discovering mold under an old floor is common and expensive: remediation runs about $10–$25 per square foot. Do not let a flooring crew simply cover it up.

How to choose

Find the water before you fix the floor
Cupping, buckling and mold are symptoms. Repair the floor first and you pay twice.
Photograph problems early and date them
Warranty and workmanship claims turn on when the defect appeared. Photos with dates are the difference between a repair and an argument.
Peaking is usually the installer's problem
Missing expansion gaps are a workmanship issue, not wear and tear. Ask the installer to return before you hire anyone else.
Get moisture readings in writing
Ask any contractor diagnosing a moisture failure to record subfloor and flooring moisture readings, not just to describe them.
Treat bounce and slope as structural
A springy floor is a joist question. Flooring installers are not the right trade for that.
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All flooring problems

Damaged Hardwood Floors

Warped Flooring

Squeaky Floors

Worn Carpet

Peeling Vinyl Floors

Cracked Tile Floors

Moisture Floor Damage

Uneven Subfloor

Allergen Carpet Issues

Outdated Flooring Style

Pet Damaged Floors

Sun Faded Floors

FAQ

Flooring problems — common questions

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The underside of the boards is wetter than the top — typically a damp crawlspace or basement, a slab without a vapor barrier, or a slow leak. Fix the moisture source and let the floor dry before any sanding.
Almost always no expansion gap at the perimeter, or the floor is pinned by cabinets, a transition strip or a fastened baseboard. It's an installation defect and the installer should address it.
Often yes, especially if you can reach the subfloor from below. From above, fixes are more limited. Persistent bounce or slope points to joists, which run roughly $125–$315 each to repair.
Stop and get it remediated properly — roughly $10–$25 per square foot. Installing new flooring over mold hides it for a year and costs more later.
Sources

Where these figures come from

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