High-density PVC foam boards are incredibly versatile. However, using the wrong thickness for load-bearing zones is a common error. This spec-sheet maps the correct polymer sheet thickness to typical architectural and cabinetry applications to optimize stability and prevent bending.
The 18mm Rule for Load-Bearing Kitchen Cabinets
For structural carcasses like modular kitchen sink cabinets or heavy wardrobe base shelves, 18mm WPC/PVC foam boards (calibrated at 0.55g/cm³) must be specified to resist sagging. For protective moisture backings behind fluted decorative wall louvers, a thin 5mm or 6mm PVC board is the industry standard.