Before the leveling layer is constructed, the grassroots must be cleaned, and the loose debris on the structural layer should be removed. The mortar and ash on the protruding grassroots should be chiseled off, swept, and rinsed with water.
Find the level layer before the construction of the grass-roots clean-up, the structure layer above the loose debris clear, protruding from the grass-roots mortar, ash with chisel chisel, sweep clean, rinse clean with water.
Before the construction of the leveling layer, the base should be cleaned up, the loose debris on the structural layer should be removed, the mortar and ash protruding from the base should be chiseled, swept and washed with water.<br>