Which laminates are waterproof?
Short Answer
Truly waterproof options are PVC laminates and high-pressure laminate (HPL) with sealed edges over BWP marine ply. Regular decorative laminate (1 mm) is water-RESISTANT - it survives splashes and damp wiping fine - but not waterproof, so it will swell and delaminate if the substrate underneath gets wet and stays wet. For bathrooms, balconies and undersink areas, use PVC laminate. For kitchen splash-back and counter edges, use decorative laminate on BWP plywood with every cut edge sealed with PVC edge-banding or silicone.
Detailed Explanation
There's an important difference between water-resistant and waterproof. Standard 1 mm decorative laminates are water-resistant on the surface - coffee spills, splash-back, daily wiping with a damp cloth all work fine - but they are not waterproof, and the moment water finds its way to the edge or behind the laminate, the substrate (plywood/MDF) will swell, the laminate will delaminate, and the surface is ruined. To make a laminated surface truly fit for wet environments you have two routes. Route 1: switch material - use PVC laminate, which is intrinsically waterproof and doesn't care if it sits in water. This is the safest choice for bathroom shutters, undersink cabinets and balcony cabinets. Route 2: stay with decorative laminate but build the system properly - use BWP (boiling water proof) marine ply as the substrate, seal every cut edge with PVC edge-banding or silicone, and make sure no water can sit at the back of the panel. Route 2 is what good kitchen fabricators do for splash-back areas. For genuinely wet zones (bathrooms, balconies), Route 1 (PVC) is more forgiving and lasts longer.
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