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In the past few years, asphalt has been strictly prohibited in the interior decoration of civil buildings, and its harm is far greater than formaldehyde. You can buy other waterproof coatings (for roofing, such as JS waterproof coatings), brush the floor twice, the thickness is greater than 2mm, and turn up more than 150mm along the corner of the wall. Then do the surface layer and find the drainage slope slope to the floor drain.
At the junction of the pipe and the floor slab, it is best to do a little more concrete flanging. Also, if the wall is brick, it is best to make a 150mm high concrete flange along the corner of the wall, and then make a waterproof coating. This is engineering practice.
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Paint the floor slab several times with melted asphalt, especially the junction between the sewage pipe and the floor slab, and the amount of height depends on the actual situation, as long as there is enough slope so that the dirt can flow smoothly into the sewage pipe.
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Do soft and hard waterproofing, the height is not less than 40 cm.
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Generally, the suction cup type and paste type can be used for a short time, and the long-term one seems to be only nailed.