Technology of parquet works

Paul in modern buildings, usually multi-layered . Each layer performs a specific function. The upper layer of the floor - coating is exposed to all operational actions (walking, running, jumping, moving things, cleaning, etc.). coatings are continuous and piece of material. Parquet all types - single-part coating. Intermediate layer connecting the coating with the lower elements and serves to cover the elastic foundation, called the stratum. With parquet flooring adhesive layer serves as a sealant, or paper (cardboard, asphalt). To form a continuous rigid surface of a porous non-rigid materials suit screed. screed is done and the concrete elements overlapping - for alignment. Currently, the most common cement-sand screed, screeds of cast asphaltic concrete, lightweight concrete and ksilolitovaya. The main material used parquet, wood-is a valuable building material. Its features are high strength at low volume weight, low thermal conductivity and, consequently, high thermal insulating properties, ease of processing, bonding and finishing, decorative and durable under normal operating conditions. Of particular importance is to change the properties of wood moisture content depending on the environment. Excess moisture content of wood is dangerous because, it dries, the material decreases in the volume is deformed and cracks. Humidity of parquet - the main indicator of his fitness. When humidity over 10% of it must be dried. Humidity in the room where the parquet must be 60%, with high humidity parquet always moisturized and increases in volume, that leads to marriage. But the quality of the floor depends not only on the parquet. To a large extent it depends on the base, mastic adhesives, air temperature and humidity in the room where the work being hardwood. parquet layer must be familiar with the properties of all materials with which he will work as in all stages of parquet works (preparation of the subfloor, stowage and flooring, skirting fastener or fillets, sanding, sanding and finishing of coating) the quality of the materials determines the quality and appearance of the floor. But along with the positive qualities of the wood has some drawbacks : heterogeneity of structure (different strength along and across the grain), the ability to absorb water and dry out (to swell and buckle up), easy inflammability and the ability to decay. The structure of wood can be clearly seen on the front section of the trunk (Fig. 7). The outer layer - the bark is Soft cork fabric. Next is a thin layer of bast. In Anyway is barely noticeable, slimy layer of cambium, through which there is growth and wood. cambium Running for the most moist and soft piece of wood is called sapwood. In the central part of the trunk is a core consisting of dead and dying cells. In the center of the core - soft and friable core, discarded when cutting the trunk at carpentry materials. Flaws and defects of wood can be divided into nine groups: knots, fungal lesions, chemical stains, insect damage (worm), cracks, defects of the structure of wood , defects form the trunk, foreign inclusions and deformation. Seven of the first groups are considered when assessing the quality of the parquet. Knots - the most common and inevitable defect of wood, which violates the homogeneity of its structure. Fungal lesions develop in the room to complete destruction of the wood. especially dangerous brownies mushrooms. Chemical color, affecting the appearance of wood, are the result of chemical processes associated with oxidation of tannins contained in the timber. Insect damage (larval beetles drevesnikov) destroy timber, significantly reducing its strength. fractures can be of various types, sizes and backgrounds. Very distributed cracks caused by improper drying. Flaws structure of wood can be divided into several types: the slope of the fibers, curly gain, pinstripe, resin pockets, etc.