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Bankirai is used in Asia untreated in construction and shipbuilding and has a very long life there. Therefore, it is also suitable for the garden and can be used as a floor covering for a terrace, for pontoons on ponds or as hardwood for stairs to overcome height differences.
The stairs from Bankirai boards
Bankirai is the wood of the Yellow Balau, which grows in the southeastern part of Asia and especially in Indonesia. This hardwood is completely resistant to moisture, mold and fungus and therefore has a long outdoor life. It can be installed on the terrace as well as near ponds or streams. Bankirai wood is very hard, so when you use the stairs will show signs of wear only after a long time. For the construction of a staircase either special staircase boards or the conventional decking boards can be used, which are now available at many retailers. They have a grooved surface from above as well as from below, which ensures that the surface does not become slippery when wet. Usually, the wider ribbed surface is laid up when laying, but for reasons of appearance, the finely corrugated side can also be used.
When building a staircase yourself, good tools are needed, because this wood is very hard and therefore not quite as easy to work with. It may only be fastened with stainless steel screws, because iron and galvanized metal would cause unsightly stains during oxidation. Especially in the first time it can happen in the rain that dark ingredients bleed out of the wood. These stains can hardly be removed if they reach light brickwork or the like, therefore, if necessary, to provide the necessary protection. Bankirai darkens like other types of wood and gets over the years an olive brown to reddish brown color.
The right care of the steps
Bankirai wood does without any wood protection. However, as the steps may become slippery when wet, it is recommended to treat them with a wood oil. There are special anti-slip oils, which are usually slightly colored to emphasize the natural color of the wood. Also an oil glaze can be used for this purpose. The oil not only reduces the risk of slipping, but also prevents graying of the wood and extends its life. The treatment with an oil should take place once a year, but this should not be used every time inked oil, because the wood is otherwise very brown and it darkens anyway with time. For the annual care of the stages therefore a pure oil without color pigments is better suited. In order to save a step in the installation of a staircase, already treated planks can be obtained from some suppliers.