What are the precautions for the backfilling steps
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Floor heating installation is a very professional technical activity, because it involves various floor heating pipes, auxiliary materials, etc., and the installation process is relatively high. The backfilling in the process of floor heating installation is a key process in the whole floor heating construction, which plays a decisive role in the backfilling surface, thermal insulation and heat storage and energy-saving effect of floor heating in the future. Let's follow the 德国 PVN floor heating to learn about the following problems that need to be paid attention to during floor heating backfilling.
1、 Backfill material
The backfilling material for floor heating is mainly composed of bean stone, sand and cement. Bean stone cannot be added to the backfilling of ultra-thin floor heating. If conditions permit, some rice stone or stone powder can be added.
2、 Backfill standard
The proportion of floor heating backfilling is pea stone, sand and cement mixed evenly according to 3:2:1. Especially in the process of home decoration backfilling, remember that mixing is the most important link. The backfilling standard is C15, which means that the bearing capacity of the concrete backfilled for floor heating is 15MPa, which is directly expressed as 150kg gravity per square centimeter.
3、 Backfill hanging net
The backfilling of floor heating must be hung with galvanized steel wire mesh and silicon crystal mesh. Galvanized steel wire mesh shall be 2mm thick and 10cm grid; The tensile pulling force of silicon crystal mesh is no worse than that of steel wire mesh, and the vertical and horizontal tensile force reaches 1200n. It can bear the ground load during ground heating backfilling, which is convenient for construction and cheap. Now silicon crystal mesh is mostly used in backfilling, and the steel wire mesh will be replaced slowly.
4、 Thickness of backfill
The backfilling thickness of traditional floor heating is 4 cm, and that of ultra-thin floor heating is 1 cm above the formwork. All thickness standards are subject to the indoor horizontal line. In practice, if the floor material is floor tile, there is no special requirement for the level, because the later tiling also needs to be leveled. If the floor material is wood floor, it needs to strictly adopt the level as the standard, and it also needs to be calendered and leveled.
5、 Backfilling process
The materials shall be stacked from bottom to top according to the order of stones, sand and cement, and then the water generation time shall not be less than 30 minutes, and then manual mixing shall be carried out. Of course, if tooling is required, the mixer is the best if conditions permit. After mixing, the hook is scattered and leveled, and then the leveling operation is refined. Before that, it's best to make horizontal points independently for each room according to the horizontal line, which is the best for the final leveling effect. After all, the backfilling of home decoration is done manually, with a certain error. The standard of error is 5mm horizontal line. The acceptance standard of tooling is 1m guiding rule and 2mm feeler gauge, which is the highest standard. Don't force home decoration.
6、 Inspection before and after backfilling
It is necessary to check the water pressure of the pipeline and check the data of pipe pressure test before backfilling. It is necessary to record before backfilling and check the data after backfilling. This is an important test for the safety of the floor heating pipe. If any problem is found, it shall be handled immediately, otherwise the consequences will be very serious.
7、 Curing after backfilling
After the ground heating backfilling, if possible, it is best to spray water for maintenance for more than 7 days to avoid direct sunlight. In winter, the maintenance time should be appropriately extended to 10 to 15 days. The backfill mark and bearing capacity of floor heating can be achieved only after normal construction and maintenance. The lowest layer of floor heating is insulation board, which is extremely non absorbent. You can see with your naked eyes that the surface of the backfill layer is dry. In fact, the bottom is not completely dry, and the strength is completely unqualified.
It can be seen that the installation and backfilling process of floor heating is relatively complex. Only by strictly following the signs step by step can the installation of floor heating be completed more smoothly and lay a solid foundation for the stable provision of warm and comfortable temperature in the later stage.
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