No wonder the waterproof layer is cracking again! It's because of this

Waterproofing is an important process in construction, and waterproofing without cracking is the key to waterproofing effect, once waterproof construction after cracking, will lead to waterproof work before the end. So, what causes the waterproof construction after cracking?
Cause one: a single brush too thick
waterproof construction must follow the "thin brush many times" principle, a single brush too thick easy to lead to the waterproof layer surface dry fast, while the internal dry solidification slow, waterproof layer due to the internal dry solid contraction is inconsistent and cracking. In actual construction, if the pursuit of efficiency, the stirred slurry will be poured to the ground at once, and then spread out with roll-on or brush, this process can easily lead to the waterproof layer painted too thick and eventually cracked .
Cause two: yin corner, pipe mouth and other node parts mishandled
Yin angle is the junction of the wall floor, waterproof construction, the waterproof slurry in this part is easy to produce accumulation, resulting in too thick waterproof layer in the dry solidification process cracking, in addition to the yin corner part due to the building itself sinking There are stress concentration and further easy to lead to the cracking of the waterproof layer, the pipe mouth, that is, the junction of the sewer pipe and the ground, the waterproof slurry in this area is also prone to accumulation, and because the water pipe is not fixed there is a slight shaking, and easy to lead to the waterproof layer cracking. In order to avoid cracking of the waterproof layer in the node area such as the corner of the yin and the mouth of the pipe, the rounding treatment should be carried out without water leakage before waterproof construction.
three reasons: the grass-roots treatment
waterproof construction should check the grass-roots level, to ensure that the grass-roots clean, hard, no cracks and so on. If the grass has dust or poor strength, will lead to waterproof layer and grass adhesion is not secure, and eventually make waterproof layer shell, cracking problem. If there are cracks in the grass roots, water should be used before the waterproof construction for crack repair, otherwise with the extension of the grass cracks will lead to cracking of the waterproof layer.
Reason Four: waterproof material selection is not right
waterproof material because of its waterproof principle, its characteristics are very different, but also make different waterproof materials have different applicable ranges, waterproof materials are generally divided into rigid waterproof and flexible waterproof. For example, underseating, roofing or slight vibration of the grass-roots waterproof construction, due to the grass-roots heat expansion cold shrink or vibration and other reasons deformation is larger, need to choose a more flexible waterproof products, such as the choice of rigid waterproof, it is easy to lead to waterproof layer because it can not resist the grass-roots deformation and cracking.
what is JS waterproof
JS waterproof coating is the short name of polymer cement waterproof coating ("JS" for "polymer cement" pinyin head), polymer cement waterproof coating refers to acrylic, ethylene-ethylene-ethylene acetylene and other polymer emulsions and cement as the main raw materials, add fillers and other additives preparation, water evaporation and cement hydration reaction cured into a membrane of the two-component water waterproof coating.
According to the national standard GB/T23445-2009 "polymer cement waterproof coating", JS waterproof coating according to the physical and physical properties of the product is divided into I. type, II. type and III. type, of which I. type of unprocessed fracture elongation rate is not less than 200 The unprocessed fracture elongation of type II. is not less than 80%, and the unprocessed fracture elongation rate of type III. is not less than 30%, so it can be seen that JS I.type waterproof coating is suitable for the grass roots with a large amount of activity, and JS II.type and III.type waterproof coating is suitable for the grass roots with a smaller amount of activity.