The experience of wood
The properties of the wood reflect the quality of our windows and doors. Wood is not just wood. Wood has so many different characteristics. Kastrup does not use cheap wood with visible knots and resin pockets that lead to resin seepage. At Kastrup we use slow-growing pinewood with a core share of 90%. Wood that has grown slowly is strongest and, accordingly, best suited for use in windows. The core is the innermost part of the trunk, and the main function of the core is to give the wood strength. Pinewood also has a resin content that provides natural protection against rot and fungus. To achieve the best quality, the wood is scanned to reveal knots, cracks and resin exudations, which are then removed. That prevents large brown blotches from knots and resin seepage.
When the wood is cut up, it is glued with finger joints for planks. This ensures a good product, which is virtually knot-free, and provides stability of shape, since the finger joints almost double the tensile strength of the wood. We only work with carefully-selected suppliers who can vouch for the fact that their wood comes from environmentally-friendly, sustainable forestry. All wood is either FSC® or PEFC® certified.
Kastrup works exclusively with European oak from selected quality suppliers. Oak is a very durable, heavy and stable material. Our mahogany hardwood comes from sustainable forestry. The hardwood is given a basic treatment, using clear oil against mould before the product leaves the factory. Kastrup also has experience with Kebony, which is an environmentally-friendly alternative to tropical hardwood.