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    Construction Performance Guidelines

About the Guidelines

These helpful guidelines outline work and material deficiencies in new homes and residential condominium units covered under the statutory warranty [...]

Strip Hardwood Flooring Is Cupped (High Edges)

Article Number




Acceptable Performance/Condition

Strip hardwood flooring shall be installed without cupping.


One-Year - Work and Materials. · Damage caused by improper maintenance is excluded from the statutory warranty. · Cupping caused by excessive humidity due to failure by the homeowner to maintain adequate ventilation is excluded from the statutory warranty.


One complete heating and cooling season should be allowed as the problem may remedy itself. Cupping identified at the time of the PDI shall be repaired. Cupping that occurs after the PDI and is proven to result from defective work or materials shall be repaired.


Identify any damaged hardwood flooring on the PDI Form to avoid any dispute about whether the damage was caused by the builder. Cupping of hardwood strip flooring results from excessive moisture when the humidity below the finished flooring material is substantially higher than above. The homeowner has a responsibility to maintain indoor humidity levels through humidification, ventilation, air conditioning or dehumidification to prevent permanent, irreversible damage. A hygrometer can be used to monitor indoor humidity levels. The immediate sanding of a cupped floor without first allowing it to correct itself may cause even more damage. This condition commonly occurs when houses do not have adequate ventilation and can, under certain circumstances, result from defects in work or materials. See Appendix A2 “Moisture in Wood and Laminate Floors” for more information. See Also: 12.22 THE SURFACE OF ONE STRIP OF HARDWOOD OR PARQUET FLOORING IS HIGHER THAN ANOTHER Appendix A2 “Moisture in Wood and Laminate Floors”