Cause Analysis:

Moisture on the wall is the main cause of mold, yellowing, and long hair on the wall. There are generally three reasons for the wall to get wet:

First, the water supply pipe or heating pipe leaks, causing the wall to be damp.

The second is that the roof or outer wall is not waterproof or the waterproof quality is poor, and rainwater seeps into the wall or indoors.

The third is that the windows, kitchen and bathroom are not well waterproofed, which leads to the penetration of water.

solution:

First of all, the most direct way is to open more windows for ventilation and reduce the indoor humidity, that is, the water vapor content. After the wall is slightly dry, use bleach or 84 disinfectant to smear the wall for mildew, and wash with 5-10% dilute oxalic acid solution for pan-alkali salting out. The two treatment solutions are easy to irritate the skin and discolor the clothes, so you must wear rubber gloves, masks, and clothing during operation.

If there is mildew, severe pan-alkali salting out, or there is a continuous source of moisture on the wall, it is necessary to carry out the second construction of the wall to completely cure the problem of mildew and hair on the wall. The second construction of the wall is mainly divided into three steps.

1. Remove the surface layer of the moldy and hairy wall: Thoroughly remove the loose layer of the moldy and hairy part of the wall and wait for the wall to dry.

2. Rolling interface agent: After removing the moldy and hairy loose layer of the wall, roll the blue star corundum interface agent on the wall for 2-3 times until the surface is dense and no powder is lost. If there is a continuous source of moisture, brush the Blue Star Corundum waterproof elastic interface agent.

3. Apply waterproof coating: After the rigid waterproof coating is applied, cracks will occur along with the wall, which will cause the loss of waterproof function. It is necessary to use flexible or elastic waterproof coating, preferably elastic waterproof coating. Bluestar steel jade elastic waterproof coating can penetrate into the pores and gaps of concrete to form a tough elastic waterproof membrane, which can effectively prevent the penetration of water and achieve waterproof effect under the condition of ensuring air permeability. effect. After rolling the interface agent, apply a full batch of elastic waterproof coating on the wall, requiring at least 2-3 layers of scraping (the irregular parts that cannot be scraped can be painted), and the thickness of each layer is about 1mm. After finishing one layer, it must be Wait for it to cure completely before doing a second coat. The final thickness after finishing construction should not be less than 2mm.

4. Putty construction: After the waterproof coating is dry, apply putty or complete other follow-up projects in strict accordance with the relevant product instruction manuals.