Main purpose – discouraging thermal losses down. Heat should go up in the heat for pex tubing. Can run from any materials allowed in the building as a thermal insulating layer for use in the construction of gender.From whatever material is performed layer of insulation must meet the following condition:
Thermal resistance of insulation layer must be greater than the total pex tubing thermal resistance of the heating layers (including finishing coating, pex tubing ) with a maximum heat load of Radiant Floor Heating. The greater the heating load, the thicker layer of insulation.The higher the thermal resistance of the finishing coating, the thicker layer of insulation.
The most common insulation material in modern construction is Pex polystyrene. We recommend using Pex polystyrene density of not less than 35 kg/m3 (pex tubing). Pex Polystyrene lower density is not resistant to mechanical stress, is destroyed when not used carefully, and loses its mechanical and thermal insulating properties, especially against the backdrop of the ongoing civil engineering works is a long time from the end of the pipe assembly units pex tubing Radiant Floor Heating water to fill their headphones. Pex Polystyrene density of 50 kg/m3, as well as extrusion, is used in systems with high mechanical loads (auto centers, warehouse complexes with heavy loaders, heated roads, etc.).
Reinforcing fabric. Pex Rails
Reinforcing mesh step and the cell diameter of bar reinforcing mesh is selected on the basis of floor construction, based on the features of the premises (pex tubing ), its destination, loads, etc. In the standard design for easier installation used a grid, usually with a cell 150×150 mm, rod 4-5 mm. Falls on Pex polystyrene, is a real cause for the layout contours water Radiant Floor Heating. Pex Pipes are attached to the grid with plastic fasteners.
To give extra strength screed in some cases is double reinforcement: a second layer of reinforcing mesh is placed on the contours of water pipes Radiant Floor Heating. Pex Rails in Europe because of the large spread of type stacking “snake” is widely used mounting rails and clips, which are arranged on polystyrene.
Sometimes fixing reinforcing mesh and / or mounting rails used Pex U-shaped anchors. Pex pipe contours vschelkivaetsya mounting rails in the slots (pex tubing slots). In this case, apply one layer of reinforcement, are laid over the pipes.
Pex Damping tape
Damping tape is placed around the perimeter of the premises prior to pouring concrete. Serves compensating thermal expansion of concrete ties during heating. It is produced, usually polyethylene foam width of 100-120 mm and a thickness of 8-10 mm.
Water pipes contours Radiant Floor Heating stacked in accordance with the drawing (draft Water Radiant Floor Heating). Number of meters of pipe is documented and recorded in the table balancing reservoir, attached to the project. Based on the evidence of mounting structural engineer decides on the need to adjust the tuning (balancing) of the pex tubing table. As a rule, unlike the actual length of pipe from the project by up to 10%, the amendment balancing reservoir is not required.
Before filling the contours of water Radiant Floor Heating concrete is recommended to check the system for tightness. Checking the system is carried out in accordance with national building regulations. Typically, the system checks the pressure of 3.4 bar for 24 hours.
When filling Pex coolant system consistent opening and closing circuits. Obtain complete removal of air from Pex pipelines and equipment.
It is recommended to leave the system of Radiant Floor Heating under pressure on the entire course of the remaining civil engineering works (device couplers, mounting finishing coatings), periodically monitoring the level of pressure that, at any stage be sure that during the production of other works not leakproof system.
Pouring concrete is carried out after mounting the contours of water Radiant Floor Heating and testing activities. The thickness of the screed must be at least 30mm above the pipe, mark the concrete recommended no less than the M-300 (V-22, 5). In special cases (big weight and / or thermal loads on the heating stove, etc.) thickness of concrete ties and brand designers calculated based on the characteristics of the object (in this case necessarily is a separate calculation of the heating panels). The minimum thickness of screed (30mm above the pipe) is attributable primarily to not-strength characteristics, and to achieve uniformity of temperature distribution on the surface of the heating panels.
When the thickness of screed over 150mm require separate calculations of the thermal regime of the Pex heating panel with the introduction of special correction factors.
For reference: the weight of 1 square meter of ties with the 50 mm thickness is 350-400 lb.
The greater the thickness of the tie the more time is required to display it on a stable heating regime from the moment of inclusion.
Thicker screed equals greater innertsion system. The lower the thermal conductivity of ties, the higher the required temperature of the coolant.
Compensatory joints If, in connection with the great extent of the heating panel, it is divided (every 15 meters) in parts of compensatory sutures, the tube, back-crossing seam is laid in a protective corrugated tube (300mm on the left and right of the seam extension). It is recommended to pack heating circuits intact within a compensatory land, ie expansion joints must cross only pressure and return piping circuit.
The system of warm water allows the use of any plasticizers in concrete. Widely used in modern construction has received a device with a plastic tie fibrils.
To accelerate the drying of the concrete slab, which usually takes about 3-4 weeks, and reach an acceptable level of relative humidity, you can connect the Radiant Floor Heating to heat source (including an interim scheme). Recommended coolant temperature in this case should not exceed 30 ° C. The practice of water systems, Radiant Floor Heating using mode “drying” has shown many examples of the shortening of construction, especially at sites with large areas.
Relative humidity of the concrete should not exceed 85%. In the case of laying parquet or other wooden cover, relative humidity must not exceed 60%. In any case, should follow the instructions of manufacturers and suppliers of materials and technology to comply with construction and production work. Thus, typically requires 2-4 weeks from the time of pouring concrete screed before laying finishing coating.