http://www.warmfloorcenter.com/pex-tubing.html
http://www.tms-nc.com/pex-tubing/pex-tubing-design
http://www.heatlinkusa.com/pex-tubing-pex-plumbing-tools-in-plumbing-with-pex-tubing.html


Reinforcement mesh step of the cell and the diameter of rod reinforcing mesh is chosen on the basis of the floor construction, based on the features of a premise (building), its destination, loads, etc. In standard designs for ease of installation used a grid, usually with a cell 150x150 mm, rods 4-5 mm. Placed on a PEX tubing, is underlying basis for the layout of circuits of water underfloor heating. Pipe attached to mesh with plastic clamps.

   To give extra strength screed in some cases is double reinforcement: a second layer of reinforcing mesh is placed on the contours of the water pipe underfloor heating.

Rails in Europe because of the large spread of the type stacking “snake” is widely used mounting rails and clips, which are displayed on PEX tubing.

   Sometimes to fix the reinforcing mesh and / or mounting rails used plastic U-shaped anchors.

   Tube circuits vschelkivaetsya mounting rails in the slots (clips). In this case, apply one layer of reinforcement placed on top of pipes.


Damping Tape
   A damping tape is placed around the perimeter of the premises prior to pouring concrete. Serves as a compensator of thermal expansion of concrete ties when heated. Is made, usually of polyethylene foam width of 100-120 mm and a thickness of 8-10 mm.


Pipes
   Tube circuits Radiant floor laid in accordance with the drawing (draft water floor heating). Number of meters of pipe is documented and recorded in a table balancing reservoir, attached to the project. Evidence-based installation engineers decided on the need to adjust the adjustment (balancing) of the table. As a rule, unlike the actual length of pipe from the project by up to 10%, the correction of balancing the collector is not required.

Main purpose - discouraging heat losses down. Heat needs to go up in the heated room. Can be made of any materials allowed in the building industry as insulating layer for use in floor construction.

   From whatever material is not effectively enforced insulation layer must satisfy the following condition:

   Thermal resistance of insulation layer must be greater than the total thermal resistance of the heating layers (including the finish coating) with a maximum heat load on the water floor heating.

   The greater the heating load, the thicker layer of insulation.

   The higher the thermal resistance of the finish coating, the thicker layer of insulation.

   The most common insulation material in modern construction is PEX tubing. It is recommended to use PEX tubing weighing not less than 35 kg/m3. Lower density of PEX tubing is not resistant to mechanical stress, is destroyed when not used carefully, and loses its mechanical and thermal insulating properties, especially when the background of the ongoing civil works is a long time from the end of the pipe installation paths Radiant floor to fill their screed. PEX tubing density of 50 kg/m3, as well as extrusion, is used in systems with high mechanical loads (car centers, warehouse complexes with heavy loaders, heated roads, etc.).

   WARNING! USA producers (mostly) produce PEX tubing with TU, and not according to GOST: Figures in the name of products (eg, NDE-25, PSB-35) do not speak about the density of PEX tubing. Actual density, as a rule, “one step” below the figures appearing in the mark. Be careful when selecting materials.