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Building Products. During the process of building and repair, building materials and constructions undergo various physical-mechanical, physical and technological influences forces. Engineer-builder is required to considerably choose materials, products or constructions, which are stable, durable and safety enough for particular conditions. Building materials and products applied at building, reconstruction and repair of various buildings can be natural or artificial. Depending on purpose, conditions of building and maintenance corresponding building materials are selected considering certain qualities and external environment protective properties of it. Taking into account these features, any building material should possess certain building-technical properties. For example, the material for external walls of buildings should possess the least thermal conductivity at sufficient durability to protect a premise from an external cold; the material for a covering of roads should have sufficient durability and small expendability to sustain loadings from transport.