1. Base course treatment: clean up the loose debris on the upper surface of the structural layer and thermal insulation layer, and level the ash, slag and other debris protruding from the base course surface, without affecting the effective thickness of the leveling layer.<br>2. Pipe root sealing: before making a large area of leveling layer, the pipe root out of the roof shall be treated well.<br>3. Plastering of cement mortar leveling layer: before construction, water shall be sprinkled on the surface of the base course, but excessive water shall not be sprinkled; according to the slope requirements, the line shall be drawn to find the slope, generally according to the 1-2m paste point elevation. When plastering the leveling layer mortar, first according to the direction of water, and set the grid joint of the leveling layer, which is generally 20 mm wide, and connect the joint with the insulation layer, with the maximum spacing of 6 m.<br>4. Maintenance: the leveling layer can be watered for maintenance 24 hours after being trowelled and compacted. The general maintenance period is 7 days, and the waterproof layer shall be paved after being dried.<br>
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