Precautions for the construction of concrete filling layer:
1. Complete the construction of the concrete filling layer within 48 hours after the floor heating heating pipe is installed and the water pressure test is qualified;
2. The construction of the concrete filling layer should be undertaken by a qualified civil construction party, and the unit should cooperate closely;
3. During the construction of the concrete filling layer, the water pressure in the heating pipe should not be lower than 0.6MPa, and during the curing process of the filling layer, the system water pressure should not be lower than 0.4MPa;
4. The filling layer is a structural layer used to protect the plastic pipe and make the ground temperature uniform. Generally it is pebble concrete, the particle size of the stone should not be greater than 10mm, the volume ratio of cement mortar should not be less than 1:3, and the concrete strength grade should not be less than C15. The thickness of the filling layer should meet the design requirements, and the flatness should not be greater than 3mm;
5. The floor heating system needs to lay expansion joints at the vertical junction of walls, columns, gates, etc., and the width of the expansion joints should not be less than 10mm. When the floor area exceeds 30 square meters or the side length exceeds 6m, expansion joints should be installed. The width should not be less than 8mm; the above expansion joints have been laid before the construction of the concrete filling layer. When the concrete filling layer is constructed, care should be taken to protect the expansion joints from being damaged;
6. During the construction of the concrete filling layer, it is strictly forbidden to use mechanical vibrating equipment; the construction personnel should wear soft-soled shoes and use flat-head shovels. Floor heating-10. Precautions for decoration and construction of the ground floor.