Before the exterior wall coating construction, the base layer of the exterior wall shall be flat, smooth, free of hollowing, no cracking and peeling, etc., square yin and yang angles, straight lines, no oil stains and rust, no cracks greater than 2mm, plastering layer The moisture content should be less than 10%, the PH value should be less than 9, and the installation and closing and closing of the outer window railings, window frames, and pipes should be completed. If there is laitance on the surface of the base layer, it must be removed first and the obvious joints and protrusions should be smoothed with a hand-held grinder. For the hollow part, all the hollow drum and the surrounding 10cm should be removed, and the putty should be repaired with cement sand Repair, after drying, you can enter the next process; for cracks larger than 2mm, first use a chisel to form a V shape perpendicular to the wall, and then use repair putty to repair it.
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