According to the specification, the backfill soil of floor heating is pisolite concrete backfill soil, which is mainly composed of cement, sand and pisolite. In order to fight the price war, some backfill companies deliberately lower the price to reduce the material cost, so they will cheat on the ingredients, so the owners must pay attention to this when backfilling.

Batching requirements

1 cement, the cement must be above 32.5, the sand must be coarse yellow sand or river sand and bean stone with large and uniform particles, and the bean stone must be about 10mm. The volume ratio of cement mortar shall not be less than 1: 3, and the strength grade of concrete shall not be less than C 15. Filling layer thickness should comply with the design requirements, flatness is not more than 3 mm ..

Backfill thickness

Theoretically, floor heating extruded board needs 5 cm of concrete. However, due to the actual height and bottom decoration requirements, the backfill soil for floor heating can be limited to about 3-4 cm. If the tiles need to be polished to a rough surface, the wooden floor should be paved after backfilling, and then the wooden floor should be paved after achieving the mirror effect.

Matters needing attention in transportation

When backfilling transportation materials with floor heating, be sure to let porters walk or pull carefully. It's best to pave the road with backfilled sand first, and remember not to mess up the already-coiled floor heating pipes.

Freeze in winter

Pay attention to anti-freezing when backfilling the floor heating in winter. If the temperature is below 5℃ and no anti-freezing measures are taken, then the concrete may not condense and will accumulate dust after drying. So when you do floor heating in winter, you must close all the doors and windows.