ROUGHNESS AND PLANE MARKS
On some slats or wood planks, some so-called plane marks (rough areas on the surface) can occur. In spite of utmost accuracy whilst machining, these rough areas cannot be avoided. Especially when working against the wood grain or around knots, depending on the wood species rough areas and split fibres are possible. These plane marks, as well as frayed ends, may occur but can be removed easily.
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INTERPLAY OF COLOUR
Depending on the type of wood, single wood profiles stand out in decking, screens and fences through their natural interplay of colour. These differences in interplay give the product a lively appearance and emphasise the natural, individual character of the wood. This natural interplay of colour is not criteria to be used for sorting.
Natural weathering like sun, moist and UV radiation affect the wood depending on the respective wood species. This way cracks can form which have no influence on the durability. Formation of cracks is a normal characteristic of wood and is no grounds for claims.
KNOTS AND WOOD GRAIN
Depending on the wood species, origin and local growing conditions, the number and size of knots can vary. Healthy knots give the wood character and an individual, lively optic. They are not defects and their numbers, size and shape are not limited. Single rejected knots, e.g. on the edges, are not always avoidable but have no effect on the durability of the wood. Also on colour-treated wood surfaces, knots as well as larger knots with small cracks are nature elements in its appearance.
SWELLING AND SHRINKING
Wood is a natural material which swells and shrinks. Therefore changes (up to 10%) in the thickness and width of wood profiles can occur due to influences from humidity. This swelling and shrinkage should be taken into account in planning, especially for decking installations. In screens shrinkage can also make the untreated tongue and groove connection visible. This is unpreventable and can be treated by applying another coat.
Stated measurements of profiles and boards are dimensions for calculation which can differ up to 5 cm in length and up to 1 cm in width from the actual size in the terrace area. This is based on harvesting and due to swelling and shrinkage.
Naturally grown construction materials may show different degrees of warping. The distance between sub-construction profiles for wooden decking plays a major role in the prevention of warping. Profiles which are already warped can be cut during installation. By cutting profiles during installation warping can be reduced. Every profile can show signs of warping in its total length.