The first thing that lays the groundwork for future durability window – a selection of wood and wood drying. The quality of wood depends on its breed and variety. Tree species are divided into coniferous and deciduous. Softwood the most widely used for windows are pine, spruce and larch. Among the most widely used hardwoods are oak, mahogany, meranti. The name is often used to refer to all the so-called red- wood, mahogany but belongs to a different kind than Meranti. Meranti – a group of wood species, widespread in Southeast Asia.
Mahogany and meranti practically do not rot, have high strength, well tolerated in a moist environment, which is associated with the peculiarities of their growth. Physico-mechanical properties of wood depend on its moisture content. When drying wood is removed first capillary moisture, then evaporates hygroscopic, and the volume of timber decreases and strength increases. The wood is dried to a moisture content of 12%, then timber is ready for further processing. The design of multi-layer timber prevents any distortion and ensures accurate dimensions. Three-layer window scantlings has a higher strength compared with the same from the array. In addition, prior splicing removes all defects of wood, and such timber is more durable. To prolong the life of wood products in modern wooden windows uses a special processing of wood, which provides: * impregnation, which protects the wood from damaging its fungal stain, mildew, reduces moisture fluctuations in wood, as well as a long time keeps the quality of the wood surface due to the limited penetration of moisture * primer and paint.