How to handle cracking of waterproof sealant?
1. During seasonal changes, it is common to see peeling and cracking on walls. This is due to significant temperature fluctuations, which cause the wall to expand and contract, leading to cracking and peeling. Additionally, some issues arise from inadequate preparation of the substrate before painting. Before painting, it is essential to thoroughly remove any existing waterproof coatings and putty from the wall surface. At a minimum, apply two coats of putty, allowing the first coat to dry completely before applying the second.
2、In autumn, excessive dryness can cause cracking. Address this in the spring. For hairline cracks in the waterproof adhesive, apply two or three coats with a scraper, then apply latex paint. For cracks in both the putty layer and the substrate, remove the coating from the cracked areas. Repair cracks in the substrate with leveling plaster, then apply waterproof adhesive. Finally, apply putty powder to the putty layer, then apply the waterproof adhesive.
3. When applying waterproofing, it is crucial to follow the steps carefully. Two coats of waterproofing agent should be applied, and each coat should not be too thin or too thick. This ensures the quality of the waterproofing layer and its effectiveness.
4、When purchasing waterproof materials, it is important to choose high-quality products. Waterproofing is applied beneath the surface, and if problems arise later, rework or repairs will be very difficult. Therefore, it is best to ensure a proper waterproofing application from the beginning, which will create a more comfortable living environment.
What are the possible causes of cracking in waterproof adhesives?
1、Waterproofing cracking may be caused by improper preparation of the waterproofing substrate. For example, if the substrate's surface debris is not properly cleaned before waterproofing, or if the edges and corners are not thoroughly cleaned, it is very easy for debris to accumulate.
2、Waterproofing issues such as cracking may also be due to inadequate preparation of the substrate. If the substrate itself has voids or cracks, the waterproofing layer applied on top will inevitably have cracks.
3. Waterproof adhesives typically require two coats of application. Some workers, to save time and effort, apply a thick layer directly. However, this can lead to uneven evaporation of moisture, resulting in cracks in the waterproof layer.
4、Poor quality of the waterproof adhesive itself can also lead to cracks in the waterproof layer. Good waterproof adhesives should have properties such as extensibility, adhesion, and weather resistance. Using low-quality waterproof adhesives is essentially the same as not using any waterproof agent.