Expansion cracks (excessive)

Description
Excessive expansion gaps are of greater concern because they are much larger than that can be considered normal expansion gaps.

These gaps may well be clustered in small localised groups (rather than smaller gaps across the floor), giving a very uneven appearance to the floor. If these gaps do not close up during humid months, it is unlikely that they are the result of normal atmospheric changes.

Possible causes
If the wood flooring is finished in a surface coating (such as polyurethane) which was applied after installation, some edges may become glued together, which prevents shrinkage occurring between the two floorboards. A build up across several boards can lead to a much larger expansion gap occurring when the boards are eventually able to separate. Because the shrinkage only occurs at the weakest points, the cracks multiply at these points.

These cracks can also be caused by inconsistencies and variations in the sub floor underneath the wood flooring - possibly caused by heating ducts, hot water or heating pipes, or the type, age or condition of the sub floor.

Remedial tips
Consider adding extra insulation as appropriate for hot spots, and adding extra expansion joint measures and extra supports for sub floor systems.

As a last resort, floorboards may need to be replaced - but please note that the new boards may not match the surrounding floorboards.

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