Posted on September 24th, 2026

Recently inspected an engineered hardwood floor, about seven years old, installed over a crawl space. The homeowner reported blistering, cracking, and chipping at plank edges and corners.

Here's what the evidence showed:

• Floor flatness was well within tolerance

• Subfloor and trim moisture readings were normal

• Fastener spacing and end-joint stagger met the installation guidelines

• Expansion space was present at the accessible perimeter

• The crawl space had a full vapor barrier

• There was no sign of impact damage

One detail carried a lot of weight.

The chipping and splintering appeared on both the tongue and the groove sides of the planks. If fastening were the primary cause, a more consistent relationship to one edge would generally be expected.

Installation-related problems also usually reveal themselves within 6 to 12 months. This one was first noticed in year one but not reported until year seven.

The home had no humidity control. The manufacturer's guidelines call for 35 to 55% RH, and without humidification or dehumidification, that range may be difficult to maintain consistently.

In our region, homes without humidity control can drop into the teens and low 20s during heating season. Years of that kind of dryness can pull moisture out of the wear layer, leaving veneer edges brittle. Brittle edges can then snag on socks, cleaning cloths, and vacuum attachments and begin to chip.

Takeaways:

• A floor that passes every installation check can still fail from its environment.

• Interior RH is one of the most overlooked variables in engineered wood performance.

• Document the pattern, not just the defect. Where and how the damage appears often tells you why.

• Report concerns promptly. Time between first observation and a claim makes root-cause analysis much harder.

After 40+ years in this industry, I still believe the floor tells the story if you're willing to measure, document, and let the evidence lead.

Homeowners: If you have wood flooring, keep your indoor humidity within the manufacturer's recommended range year-round.

Installers and retailers: Talk about humidity control before the floor goes down.

#FlooringInspection #EngineeredHardwood #HardwoodFlooring #FlooringIndustry #CFI #BuildingScience #HumidityControl

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Cunningham Flooring Specialists