When the device internal PEX tubing networks (radiant heating, hot and cold running water, gas, sewer and drains) used tubes of different strength and surface hardness of materials (steel, copper and various PEX).
Some of these pipelines are almost always located in the interior ceilings, walls, walls and foundations. For risers, for example, the length of this part can be up to 10% (the distance between the sexes of adjacent floors - 3 m and the thickness of the floors - 0,3 m). The above elements of buildings can be implemented as a solid (concrete, bricks, etc.), and a relatively soft (wood, plaster, sheetrock, etc.) of building materials.
In this context, the assemblymen domestic pipeline networks, the question always arises [1], which are connected with the omission of polymer piping through constructions:
* How will affect the long-term strength behavior of soft polymer piping it into direct contact with the element of solid building material;
* How will affect the strength of the direct contact element of soft construction material to the pipeline of solid material.
