(One Hundred Questions on Waterproofing) #39: Roofing waterproofing renovation project, found that there was a water leak. Since the foam cement and thermal insulation tiles on top are difficult to remove and transport, is it possible to apply a series of waterproofing materials or a baking-type waterproof membrane directly on top after making some minor repairs and leveling the surface? Why?
A: No, that kind of “treating the symptoms without treating the root cause” is the most unprofessional approach. According to my experience, whether it’s PU or waterproof felt, if it’s applied directly to the foam, it will only worsen the situation.
(One Hundred Questions About Waterproofing):#38 Can leaking water on balconies and terraces be cured by simply applying colored PU or acrylic rubber waterproofing materials on top of it, achieving a permanent stop to the leak?
Answer: No. Regardless of the type of waterproof material, it is best to apply it directly to the structure; if it is applied to the tiles, because the tiles themselves do not have any pores, the waterproof material will then adhere to the tiles.
(One Hundred Questions on Waterproofing) #37 New Construction Projects: Applying a wiping-type waterproofing system (including general two-fluid PU, super-fast curing PU, oily rubberized asphalt, etc.) for waterproofing projects. In order to expedite the work, the water accumulates in low-lying areas on the roof and is drained away using a gas spray gun. After drying it with the spray gun, construction is immediately started; are there any aftereffects to be expected? How can they be overcome?
A: Such construction can easily cause the waterproofing material to swell, become poorly attached, crack, and degrade within one month of installation. This is because the water that seeps into the structure cannot be drained away.
(One Hundred Questions on Waterproofing) Question #36: How effective is this method of construction in the market? Why? How can it be improved?
A: 1. In the case of waterproofing construction on a new construction site, using this method (after preparing the base soil and applying a primer oil, the waterproofing membrane is directly applied in a baking or self-adhesive manner) […]
(One Hundred Questions on Waterproofing) #27 In recent years, there has been a growing trend toward the use of highly effective waterproof materials. What are the unit prices and applicability of these materials?
A: Since the high-speed rail track base slab and some station roofs in Taiwan have been equipped with high-performance waterproof materials, some public works projects and private high-end residential buildings have also gradually opened up to the market.
(One Hundred Questions on Waterproofing) #26 Summary of the Performance Table of Waterproofing Materials for Roofing
(One Hundred Questions on Waterproofing) #25 Tests Compare the advantages and disadvantages of three types of coating materials for roofing waterproofing: liquid waterproofing, colored acrylic rubber, and emulsified asphalt.
Answer: Material type: Flexible cement Application scope: A. Liquid waterproofing (1) The liquid waterproofing coating does not require any construction joints. (2) It is suitable for complex curves and slopes. […]
(One Hundred Questions on Waterproofing) #24: What types of coating materials are currently most commonly used for waterproofing? Which type of coating has the best UV resistance?
Answer: The most common coating waterproofing materials are: (i) Polyurethane (PU): (1) Paraffin wax series PU. (2) Non-paraffin wax series PU (carbon series black […]
(One Hundred Questions on Waterproofing) #22 Which types of hot melt asphalt waterproofing felt are currently most common?
Answer: The most commonly used waterproof felt on the market today is traditional five-layer oil felt. Although it is still used in rural areas, the vast majority of new and old construction sites are switching to CN […]
(One Hundred Questions on Waterproofing) #21 Many large buildings in China have a neat horizontal birch plywood joint near the bottom of the exterior wall. Why does this occur, and how can it be remedied?
Answer: (1) In cases of plumbing leaks, it is often found that there are water leaks or watermark marks on the top of the “wind-shaped wall” in the interior. Generally, the leak-finding companies often instinctively assume that it is a leak from the exterior wall.
(One Hundred Questions on Waterproofing) #20 This well-known construction company also insists on using PU in its waterproofing contracting bids. However, some insist that PU must not be used at all, while others insist on using tear-resistant oil-based tarpaulins... How objective are these statements?
A: 1. In the decision-making process regarding the selection of waterproof materials, some people insist on using a certain material, while others insist that a certain material should not be used; in the end, the bottom line is that they are all based on experience […]
(One Hundred Questions on Waterproofing) #19 After applying a liquid waterproofing system to a roof, why do you often see needle holes and excessive bubbles? Do you have to apply a primer before applying the liquid waterproofing system? What is its function?
Answer: A. The reasons are as follows: B. The main function of the primer is: Therefore, before applying liquid waterproofing for outdoor waterproofing projects, primer must be applied first. Indoor waterproofing […]
(One hundred questions on waterproofing) Let’s #17get started. What are the most common mistakes when installing a roof waterproofing system?
Answer: (i) PU waterproof materials are divided into two categories: Currently, some waterproof manufacturers in China confuse both categories, causing some well-known developers to have a very negative attitude towards PU.
(One Hundred Questions on Waterproofing) #16 Questions Summarizing the Current Common Types of Roofing Waterproofing Materials Used in China and Their Applicable Areas
(One Hundred Questions on Waterproofing) #15: The construction seam at the corner of the roof (the corner of the daughter wall) is particularly prone to leakage (especially around the corner of the daughter wall or the pipes); so what are the key points to pay attention to in waterproofing construction?
Answer: 1. The surface preparation must be thorough—it is often found that there are remnants such as template chips, iron wire, loose stones, and floating debris, which would greatly diminish the effectiveness if not handled properly. 2. Corners […]
(One Hundred Questions on Waterproofing) #14 The roof has cracks that leak water; I want to apply a liquid waterproofing system. Since liquid waterproofing has excellent elasticity, why do I have to first treat these cracks? What are the treatment methods?
Answer: [1] Because PU has natural flowability before curing, if the cracks are not repaired first, they will seep into the structure along the cracks. When the construction is completed, the PU will harden and become rigid.
(One Hundred Questions on Waterproofing) #13: Some roofs leak water; when it rains, it doesn't leak; but when the weather clears, the water leaks again. Why is that?
A: To discuss this issue, we first need to consider the “characteristics of water”; generally speaking, rainwater passes through the roof insulation layer and then flows along the damaged area of the waterproof layer, accumulating on the surface of the structure […]
(One Hundred Questions on Waterproofing) #12: Currently, there are so-called "water-based liquids" on the market. They are said to have good elasticity, low price, and can be applied to any color. What are the facts about this? What are the advantages and disadvantages?
Answer: (i) According to my understanding; currently, there are no technical difficulties for major PU manufacturing factories in China to produce water-based liquid polyamides. However, no one company has yet developed a water-based liquid polyamide product.
(One hundred questions on waterproofing) #11: Before waterproofing the roof, I found that there were several cracks. Is it possible to first repair them with silicone and then apply a full coat of liquid waterproofing?
A. No. In the construction of waterproof surfaces, the selection of the filling material must take into account its function of interfacing with the waterproof surface. Subsequent work   […]
(One Hundred Questions on Waterproofing) What are the important aspects to consider when installing waterproof roofing on #10new construction sites?
Answer: The most likely areas for roof leaks should be identified. Detailed implementation: To prevent the secondary effects such as pressure or water-induced swelling caused by the surface covering layer.
(One Hundred Questions on Waterproofing) #9 What is birch? After handing over the mansion for sale, it is often found that the surfaces of the walls, courtyards, staircases, and flower beds have white birch growth; not only is it unsightly, but it also greatly reduces the “value” of the entire building. What is the reason for its formation? Is it related to waterproofing? Is there any special “medicine” to solve this problem? Or any root-solving methods?
Answer:
(One Hundred Questions on Waterproofing) Are the #8 Hanging Water Bulbs leaking?
My house is a house with a top floor, every time it rains the ceiling in a certain room starts to leak, and in severe cases it even drips water. I searched online for several waterproofing companies to have them inspect the problem, but none of them could provide a solution.
(One Hundred Questions About Waterproofing) #6 The wall on the wall has long hair and peeling paint; it can be effectively treated by repeatedly wiping with dilute hydrochloric acid or baking soda to neutralize the acidity and alkalinity, and then repainting. Is this effective?
Answer: Theoretically, these carbonate crystal deposits on the wall can be reduced by neutralizing them with acidic liquids such as dilute hydrochloric acid or soda water. The problem is that the concrete is not completely dissolved.
(One Hundred Questions About Waterproofing) #5 What is "wall cancer"? How is it formed? How can it be cured?
A: The term "wall cancer" is not mentioned in any dictionary or technical literature in China or abroad. It is purely a term used by ordinary mud-plasterers and painters in China, meaning "incurable".
(One Hundred Questions About Waterproofing) #4 Recently, DIY home waterproofing has become popular: how effective is it?
A: I’m afraid this question should be answered by DIY material suppliers or department stores. After completing the sales of materials, they should use an objective and scientific attitude to […]
(One Hundred Questions on Waterproofing)#3 Is the high-pressure injection method for leakage prevention really effective?
Answer: The answer is limited effectiveness! When the high-pressure infusion technique was first introduced to Taiwan 20 years ago, our company’s technicians were practically one person for one machine; however, after thousands of cases of use, the results have been very impressive.
(One Hundred Questions on Waterproofing) #2 According to market research, what is the ranking of the probability of water leakage from buildings? What are the reasons for water leakage?
Answer: A. Water leakage at the window edge causes peeling paint and wall cancer? Cause: 1. The window frame fitting is not properly installed. 2. There are cracks at the window opening. B. Water leakage from a crack in the ceiling at the ground floor? […]
(Q&A) Waterproofing the courtyard of a new construction site: which waterproofing material should be chosen? What are the material properties to consider? What are the key points to be noted during construction?
The basic physical requirements for the material to be used for courtyard support waterproofing should be: high adhesion; high extensibility; high tensile strength and tear strength; and the non-interstitial tensile strength must reach […]
What waterproof material is suitable for a long-term submerged swimming pool?
GRETEC® Gradelon has excellent strength and elongation properties, while also possessing the strength of epoxy resin and the high elasticity of rubber.