In addition to the leak of pipes caused by poor assembly, a significant danger to radiant heating is the corrosion of the pipes after sealing them into concrete. The accidents that have taken place, which opponents of radiant heating betrayed wide public, significantly delayed the development of this type of heating. Experience with reinforced concrete shows that concrete does not have a harmful effect on steel. This proof is not decisive, however, since the diameter of the reinforcement rods is always larger than the thickness of the walls of the pipes, and the possible effect, concrete on the rods of reinforcement may not lead to the destruction of the structure due to the reserve of strength. The situation is different with the pipes. If the effect of concrete causes a crack 3 mm deep in a pipe with a diameter of 15 // 21 mm, it should be 5.5 cm, of which at least 1.5 cm under the pipes and 2 cm above the pipes.
The large thickness of the panels is taken in cases where it is assumed that due to the irregularity of the surface on which concrete is laid, or due to the incorrect laying of its heating panel, the thickness of the heating panel may be, at least in individual places, less than 5.5 cm.
Concrete laying should be carried out, as a rule, at one time for the entire thickness of the panel. In exceptional cases, it can be executed in two layers, and the first layer should be at least 4.5 cm thick, and the total thickness should be at least at least 5.5 cm, not counting the thickness of the layer of the mental solution laid under the coating Paul.
g) the sizes of the panels along the contour should be carefully checked, taking into account the possibility of their free thermal expansion without damage to other structural elements. In some special cases, with large sizes of the panels, a state bopat may?>laying and their reinforcement.
h) the use of even in a small amount of all kinds of additives intended to accelerate the setting of concrete or protect it from freezing and, in particular, the use of calcium chloride is prohibited.
i) the circulation of the coolant can be started only after the full capture of concrete. The temperature of the coolant should be at first not higher than 25 ° C by a gradual increase by approximately G per day for about ten days.
2. Substances containing acids fall from the outside of the elements of the ceiling or floor, a) substances that fall from the outside and who penetrate through the upper part of the ceiling. This occurs in cases where a corroding substance is spilled onto the floor, in particular when washing tile floors with javelu water or hydrochloric acid, which enter the seams between the tiles and pass through concrete to the pipes. Therefore, it is necessary to strictly prohibit the use of corroding compounds for cleaning floors over heating panels.
b) substances falling from the upper part of the ceiling. This case takes place when the flooring is made of non -setral materials. In this regard, the arrangement of magnesial floors should be strictly prohibited, as well as the use of adhesive materials containing magnesian cement or ground.
c) substances falling from the lower parts of the ceiling. Various kinds of pipe destruction are caused by lower insulating layers or hollow elements of the overlap. These materials should not contain, even in the very small quantity, no substances that can cause corrosion of pipes under the combined effect of moisture and wandering currents. It must be, in particular, the use of any materials containing electrolytes (chlorides and iodides) should be prohibited.
It is not possible to make a list of all unwanted materials, since more and more new. In any case, materials consisting of fibers treated with chloride calcium, as well as plates from materials of marine origin, are not enough washed enough during their manufacture. All materials of marine origin should be systematically excluded from use or at least undergo preliminary careful research. Sometimes, waterproof paper is laid between the heating panel and the flooring of the floor to ensure the dryness of concrete and prevent the infiltration of moisture in it.
d) substances falling from soil. Laying plates directly on the ground requires special attention, since moisture that can get from the soil due to infiltration or capillary may contain substances whose contact with pipes is unacceptable.