Waterproof paint, tile glue, putty cracking? Do you know what to do?

Why do waterproof paints, tile glues, putty cracks?
because of the waterproof layer, tile glue, putty layer, they have a common feature: all belong to the cement-based materials (including dry mortar and concrete). Even if the cement-based material is as good as it is, there is a bad temper: contraction. Cracking, on the other

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the dry cracking of the wall-smeared mortar
the shrinking cracking of the concrete roof panel
cracking will reduce the use of cement-based materials, and in severe cases even cause the utility of cement-based materials to fail completely.
face of the irrealable trait of contraction, as long as the factors affecting contraction can be controlled, and the most important factor affecting contraction is thickness.
in the application of waterproof coatings, the same attention should be paid to the impact of shrinkage, take reasonable construction process to reduce the negative impact of shrinkage, in order to use the product to the extreme effect.
Tile glue - thin paste method
tile glue thick paste method easy empty drum off brick
tile glue such as the use of thick paste method, a larger amount of shrinkage will form a loss of bonding shear stress in the brick interface, reduce the stability of the tile system, in the environment temperature and humidity changes, or grass vibration is very easy to cause empty drum or even brick problem. When the tile glue is thinly attached to the construction, the very small contraction has no obvious effect on the stability of the tile system.
Waterproof coating - thin brush many times
waterproof paint construction is too thick easy to crack
cement-based waterproof coating to take thick coating construction, there is excessive uneven shrinkage in the waterproof layer, easy to cause cracking, damage the overall waterproof effect of the waterproof layer. Cement-based waterproof coating should be thin brush many times construction, by improving the water-resistant layer structure tightness to ensure the waterproof effect.
Cause one time brush too thick
waterproof construction must follow the "thin brush many times" principle, single brush too thick easy to lead to the waterproof layer surface dry solid fast, while the internal dry solidification slow, waterproof layer due to the internal surface dry solid contraction inconsistent and cracking.
The actual construction, part of the master single-eye pursuit of efficiency, will stir a good slurry to the ground at once, and then spread out with rolling paint or brush, this process can easily lead to waterproof layer brushing too thick and eventually cracking.
Cause two yin angle, pipe mouth and other node parts mishandled
yin angle, that is, the wall ground junction, waterproof construction, the waterproof slurry in this part is easy to produce accumulation, resulting in the waterproof layer is too thick and cracking in the dry solidification process, in addition, the corner of the yin due to the building itself subsidon and other reasons for stress concentration and further easy to lead to waterproof layer cracking;
pipe mouth is the junction of the sewer pipe and the ground, the waterproof slurry in this area is also prone to accumulation, at the same time due to the non-fixation of the sewer pipe, there is a slight shaking, and easy to lead to cracking of the waterproof layer. 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 waterproofing construction.
Underlying putty - control batch scraping thickness
bottom putty batch scraping thick caused the overall cracking of the coating finish
in the process of moisture-proof mold-proof bottom putty in the inner wall, the formation of too large contraction easy to cause cracking, cracks will also be reflected to the surface layer to form cracking, the entire coating decoration system formed damage. The thickness of a single batch scrape of the bottom putty of moisture-proof mold in the inner wall should be controlled within 3mm to 10mm, which can effectively reduce the risk of powdering and cracking of the bottom putty and ensure the integrity of the coating decoration system.
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