Why do bricklayers need to tear off the original waterproof layer before waterproof construction?

Waterproof construction is an indispensable part of home decoration. Before waterproof construction, masons sometimes need to tear off the original waterproof layer of the developer. So, why do you need to do this?

The original waterproof layer was of poor quality.

If it is found that the original waterproof layer is in poor condition, it is suggested to chisel off a layer in a small area before waterproof construction. In order to ensure the effect, it is suggested to choose waterproof materials with good reputation in the market to construct themselves. If conditions permit, the waterproof material can be mixed with water and painted twice, and each layer takes about 24 hours to completely cure. Then two layers of JS waterproof were made, and finally one or two layers of alkali-resistant primer were added to create a solid protective barrier for the home environment.

Potential damage in the process of decoration

During the renovation, the original waterproof layer is likely to be destroyed. Therefore, the secondary waterproof construction has become particularly critical. Compared with the developer's primary waterproofing, the secondary waterproofing is usually more meticulous and thoughtful, which is also an important reason why we need secondary waterproofing.