What are the safety regulations for exterior wall cleaning?

Defined by judging method, let A~B be a wall, if the wall line of A~B can cut the relevant envelope, it is an inner wall, otherwise it is an outer wall. From the architectural point of view, the boundary component that surrounds the building to form indoor and outdoor is called external wall. Its functions include: bearing a certain load, sheltering from wind and rain, keeping warm and insulating, preventing noise and preventing fire. The main reason for leakage of waterproof exterior wall is improper tile construction. The ceramic tile itself is a sintered ceramic material, so it is impervious to water, while the bonding material is cement slurry, which is easy to cause insufficient mortar on all sides of the ceramic tile and form a cavity. Waterproofing of external walls is due to slight transverse cracks and some honeycombs, pits and dog holes in cement joints between tiles. Rain can easily penetrate into the leveling layer and ceramic tile lining from these cracks, holes and holes and be absorbed in them. Because the tiles are impermeable, water is trapped inside, forming a small reservoir, which can only seep indoors. When the rain clears and the sun shines directly on the exterior wall, due to the high outdoor temperature and low indoor temperature, the water vapor stored in the leveling layer enters the interior wall through the capillary holes of the leveling layer, which causes the interior wall to be wet, the interior decoration to be moldy, and the white minerals flow out of the exterior wall from the inside, which affects the appearance of the wall.

Exterior wall coatings are used to paint the exterior walls of buildings, so the most important index is ultraviolet protection, which requires that it will not change color after long-term irradiation. Since 20 13, people have paid more and more attention to energy-saving and environmental-friendly liquid stone paint waterborne coatings. Some exterior wall coatings also require water resistance and self-cleaning. The paint film should be hard and flat, and the dirt will come off as soon as it is washed. Exterior wall coating can be used for interior wall painting because it also has water resistance; However, the interior wall coating does not have the sun protection function and cannot be used as the exterior wall coating.

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