The underfloor heating floor must be level within a 2m radius, with a height difference not exceeding 2mm. Any area exceeding this level must be leveled with cement or quick-drying cement powder. The leveled floor must meet the following requirements:
1. The moisture content of the cement floor should not exceed 10%;
2. The floor should be dust-free and clean, free of debris;
3. The cement floor should be free of cracks and deformation;
4. To ensure that doors can open freely after the floor is installed, the distance between the door and the floor surface should be no less than the floor + underlayment + 2mm thickness.
