• Resources Header

    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 [...]

Laminate Flooring Is Cupped (High Edges)

Article Number




Acceptable Performance/Condition

Laminate 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.


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.


Laminate flooring is made up of individual layers (wood particles/paste) pressed and bonded together, with an image on the surface of the substrate or underlying core layer. If the environmental conditions are too humid, the laminate flooring may expand causing all edges (side and ends of boards) to press against each other and curl upwards. Identify any damaged laminate flooring on the PDI Form to avoid any dispute about whether the damage was caused by the builder. Cupping of laminate strip flooring results from excessive moisture when the humidity below the finished flooring material is substantially higher than above. One complete heating and cooling season should be allowed as the problem may remedy itself. 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. This condition commonly occurs when houses do not have adequate ventilation and can, under certain circumstances, result from defects in work or materials. Only cupped flooring strips require replacement at the time of repair. Slight variances in colour and/or pattern are to be expected when making repairs. See Appendix A2 “Moisture in Wood and Laminate Floors" for more information.