11/30/2011

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Choosing Sealant, Sealant Application In order for oversized wall building was qualitatively constructed and its performance characteristics consistent with high standards, you need to optimally choose the right materials for sealing joints and junctions of building structures. Depending on the nature of the transition to a working state sealants are hardening, and drying netverdeyuschie. The first postmark is operational as a result of chemical reaction of composite components to each other (multi-compounds) or by the reaction of the sealant directly with the moisture of air (one-component compositions). Then, paste turns from the primary Spread the state to rubbery state. Neotverzhdayuschiesya mastics are from three to six years (less durable than the cured sealant, due to lack of rubber-like structure). They represent very viscous mass. Drying Sealants acquire conditioned by evaporation under their composition of the solvent or water. Curing mastic is made on the basis of: Thiokol, polyurethane rubber, or silicone rubber. Drying Sealants usually produced on the basis of acrylate dispersions, and neotverzhdayuschiesya based on butyl rubber. Curing sealant optimally suited for sealing joints prefabricated houses with a maximum deformation of 50%, sealing cracks, seams and joints, sealing of expansion joints of concrete floors, repairing roofs. There are governed by legislation state standards for sealing materials: Description of GOST 4.224-83, GOST requirement 25621Soprotivlenie flow at a given temperature, mm 2Uslovnaya strength at break, MPa, no less * 0.1 Fracture * an hour, at least 2Otnositelnoe elongation at break,%,...
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Classifications of Roofs Getting roofing works, we must first understand what are the roof. Thus, the classification of roofs. The main purpose of the roof is to protect the building from the top of the atmospheric effects (rain, snow, fluctuations outside air temperature, solar radiation, wind and other external factors). Penetration into the building water and cold, as well as overheating of the sun roof lead to their destruction. Which naturally affects on its economic feasibility in mind the frequent repairs and alterations. Naturally, during the roofing work has bolshshie differences in the construction of different types of roofs. The shape of the roof is divided into pitched and flat. Form the roof is determined by the architecture of the building and its configuration in the plan. On the roof structure and attic distinguish bescherdachnye. Depending on the temperature regime of the upper building envelope bescherdachnye (combined), the roof is divided into unventilated and ventilated. By appointment distinguish operated (solarium, sports facilities, cafes, etc.) and unexploited roof. Pitched roofs are the attic and bescherdachnye. Attic roofs are made with cold or warm attic. Bescherdachnye roof can be cold (over unheated buildings) and warm (over heated buildings). Bescherdachnye roof suit both residential and public and industrial buildings in the industrial and agricultural purposes. In commercial buildings, often on the covers of satisfied svetoaeratsionnye lights. Shed roof slope is based on exterior walls at different levels. Gable roof usually consists...