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Is the moisture barrier useful? Experts to answer waterproof questions

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Recently, Jinghua Home Furnishing Co., Ltd. has continuously reported on the knowledge of waterproofing and plugging in home furnishings, which has generated a lot of resonance among readers. Owners with similar distresses have called the editorial department to ask related questions. In this issue, we have selected a few typical cases from them and asked experts to conduct specific analysis, hoping to help.

In order to solve the waterproof problem at home, I checked a lot of information. I found in some regulations that in addition to the waterproof layer, the building should also have a moisture-proof layer. But the foreman said that in the home improvement project, the kitchen and bathroom space only needs to be waterproof. Excuse me, is this moisture barrier useful?
Expert answer: Xia Yan, an engineer of the China Building Waterproofing Association, said that there is indeed a waterproof layer in the home decoration, so there is no need to make a moisture-proof layer. The main function of the moisture barrier is to prevent water vapor from leaking or invading. Generally involved in the waterproofing of the roof. The moisture-proof layer in the basement was already completed in the original construction. In ordinary home improvement, the owner only needs to waterproof the kitchen and bathroom space as required, and pay attention to the closed water test.
The neighbor downstairs reported that there was water seepage in my small balcony, which caused a watermark on the ceiling of his house. I consulted a small company that could do waterproof repairs. The staff said that this was because the floor was cracked, and the mopping water in the house usually permeated, as long as the cement was poured, the construction was simple. I checked later, this construction seems to be generally used in basement projects. Is this reliable?
Expert answer: Xia Yan said that the solution provided by this waterproof repair company is not a conventional method. Cement infusion is not suitable for this case. In this process, first of all, a hole is to be punched in the floor, the tools are extended, and the waterproof material is poured in to fill and close the gaps in the floor to prevent leakage. The staff member said that it was very simple, and it actually caused a lot of damage to the home improvement. "The floor of the owner's home and the ceiling of the neighbor's home must be pierced." This method of making construction recommendations based on the owner's introduction rather than a site visit is not professional in itself.
According to the owner's situation, Xia Yan suggested that the leakage around the floor drain of the small balcony should be strengthened with a plugging spirit, and observe for a period of time to see if there is still water seepage. If it can't be improved, find a professional company to visit the specific cause of the leak, and then finalize the maintenance plan. To remind everyone, domestic waterproof construction companies need to issue a qualification certificate from the local construction authority, and consumers should pay attention to check the qualification of the construction company.
I went to the construction site at home yesterday to check the waterproofing. Who knew that if I peeled it off with my hand, I had torn off a layer. The foreman said it was okay, and he could make up again. Is it reasonable to tear off the waterproof layer?
Expert answer: The waterproof layer can be easily peeled off, which is certainly not a common sense phenomenon. Sun Pei, a senior engineering expert, said that when this problem occurs, first of all, it may be that the workers did not handle the grassroots or construction technology. Generally speaking, the base layer must be cleaned when painting waterproof, all floating ash and sand should be removed, otherwise the waterproof layer will delaminate. In addition, the workers must be uniform when mixing the materials, and the waterproofing must be applied 2-3 times. The first pass will be relatively thin, allowing it to blend with the wall. The latter two times are thicker, so that the combination can be applied to achieve the best water resistance. Inexperienced workers and poor mastery of the degree of thinness will also lead to stratification. Secondly, poor material quality can also lead to poor adhesion.
At present, the waterproof layer is partially damaged. The safest remedy is to shovel the waterproof layer and redo it, and urge the foreman to improve the process. The owner should also pay attention to selecting high-quality products at reasonable prices and conducting water-tight tests after completion. But experts also said that if the damaged part is on the wall surface, the possibility of water seepage after paving the tiles will not be too great. In this case, the owner can also repair the waterproofing without large-scale rework.
For the sake of beauty, my home was remodeled for underfloor heating. A neighbor told me that in order to prevent water seepage, it is best to put a waterproof layer on all areas where floor heating is laid. I want to ask, is this necessary?
Experts answer: Many owners have doubts about the problem of ground water seepage. In fact, under the circumstance of construction technology clearance and qualified pipe material, if there is no artificial damage after testing such as compression test, the floor heating pipeline will rarely leak. If the owner is really worried and does not care about the construction cost, it may be good to do waterproofing.
Recently, my bathroom was just finished with bricks, but before that I found that the waterproof layer was peeling and asked the foreman to redo the waterproofing again. However, the foreman used the plugging spirit to fill and strengthen it, and then laid the tiles. what should I do now? Is it necessary to knock off the tiles and redo it?
Expert's answer: According to the owner's description, the peeling problem is now the result of poor workers' construction technology. To ensure foolproofness, redo must be redone, and plugging spirit is certainly not a long-term solution. If the foreman refuses, the owner can ask for a 24-hour closed water test. If there is water seepage downstairs, the foreman must rework. However, if the owner feels that the loss of knocking off the tiles is too great, he can only use high-quality jointing agents and increase the angle of the drain slope at the floor drain in order to reduce the probability of water seepage.
In addition, experts analyze that workers should use solvent-based waterproof coatings, which are cheaper and easier to apply than cement-based flexible waterproof coatings. However, Zhu Dongqing, the director of the China Building Waterproofing Association, pointed out in an interview that waterproof and leak-proof materials have clear restrictions on national standards in regard to harmful substances. Qualified products can be used with confidence, and consumers can pay attention to the product's environmental certification mark . However, consumers are advised to purchase water-based rather than solvent-based materials as much as possible, such as polymer cement coatings and acrylic coatings, which have less impact on the human body.
The old house was leaking for many years and it scared me. Now renovate, if you apply more layers of waterproof paint, will it be safer and play a superimposed role?
Expert answer: In fact, it does not make much sense. Experts emphasize that the key to waterproof engineering lies in the nodes. The so-called nodes are various types of nozzles that penetrate the wall and the ground-floor drains, hot and cold water nozzles, and sewers. They are not properly handled at the junction with the building surface, and they are prone to leakage. Therefore, when doing waterproof layer construction, these areas should be painted with waterproof paint first, and then the wall floor should be treated. The remaining parts can be painted according to the construction requirements, and no additional number of passes is required. For insurance purposes, the owner can extend the duration of the closed water test from 24 hours to two days.
I was afraid that the neighbor ’s toilet upstairs would leak into my house, and I also painted the ceiling of the toilet. Is it possible to have no worries? My friend also painted the whole house with polyurethane material. Isn't this bad?
Experts answer: In fact, these two methods just increase the cost of decoration, but the actual use is not great. First of all, only paint the bathroom ceiling with waterproof material. Once water leaks upstairs, although this layer of waterproofing can prevent water from seeping out from here, the water is impervious and it will leak out from other weak places in the building, such as Side walls of other rooms connected to the bathroom.
Painting the entire top, wall, and floor of the room with polyurethane waterproof material is very expensive. Xia Yan, an engineer of the China Building Waterproofing Association, introduced that although polyurethane materials are not suitable for the use of tiled facades in bathrooms, they are still relatively high-end building materials. More importantly, this does not guarantee foolproofness. "There are a few points in the whole house that are insufficiently painted, and still allow water to come in." Therefore, the best way is to waterproof the kitchen and bathroom space in accordance with relevant standards. If leakage occurs, seek professional help to actively deal with it.
The height of our family is relatively high. The foreman said that the waterproofing of the façade wall with shower in the bathroom is generally one meter eighteen, but my height is more than one meter nine. Is this waterproofing required to be done in a conventional way or to change the actual situation?
Expert's answer: The relevant construction regulations do require that the façade wall with shower in the bathroom be waterproof to be one meter and eight meters high, but this is calculated based on the average height of the Chinese. However, the owners who exceed this range, it is best to measure the height of the sprinkler's parallel splashing water according to their own conditions to increase the waterproof height. In the case, the owner's height was more than 1.9m, and the waterproof must be at least 2m to be effective.
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