The floor heating floor must be level within a radius of 2m, and the height error must not exceed 2mm. The part exceeding the error must be leveled with cement or quick-drying powder. The leveled ground must meet the following requirements:
1. The moisture content of the cement floor should not be higher than 10%;
2. The ground should be free from dust, clean and free of debris;
3. There should be no cracking and deformation on the cement floor;
4. In order to ensure that the door can be opened freely after the floor is installed, the distance between the door and the floor surface shall not be less than the thickness of the floor + floor mat + 2 mm;