[Water leakage from window frames during typhoon and rainstorm] Are the windows spraying water during the violent storm? Experts in water, electricity and waterproofing teach you three-step emergency water drainage, silicone waterway plugging and a solution for water seepage in double-north window frames.

Water seepage in window frames: the physical pressure difference effect under strong wind pressure

Whenever a strong typhoon strikes, the Taipei area is densely populated with high-rise buildings, which often creates strong saddle effects and valley breezes between the buildings. Under strong winds and rain, window glass and aluminum alloy window frames will withstand huge positive wind pressure. At this time, rainwater on the outside of the window frame will accumulate in the aluminum groove guide rail. According to Bernoulli's law of fluid mechanics, when the outdoor wind speed is extremely high, the pressure difference between indoor and outdoor will form a strong suction force, which will force the rainwater that has no time to drain out of the guide rails into the room along the aging windproof strips, worn brush strips, or the aging silicone cracks between the window frame and the concrete exterior wall (waterway blockage). This is also the main physical reason why windows are usually fine when it rains, but water leaks and soaks the wooden floor once it rains, which can easily damage high-end decoration and the residual value of the house.

Step one: Emergency self-rescue in typhoon weather "Physical water drainage and diversion defense"

When the typhoon is raging and water has begun to seep into the window frames, do not blindly apply new wet silicone, because silicone cannot be bonded to wet surfaces at all. Plumbing and waterproofing experts suggest that the first step in emergency self-rescue is to drain the accumulated water in the aluminum groove of the window frame. You can use sharp tools to check whether the "outdoor drain hole (drain valve)" at the bottom of the aluminum window is blocked by dirt or gravel. Clearing the drain hole can quickly drain the water in the guide rail to the outside, reducing indoor water seepage pressure. Then, use disposable anti-leak absorbent strips and dry rags stuck at the indoor joints of the window frames, and use plastic floor protective films to physically divert and guide the overflow water into the drainage bucket to prevent the water from soaking the wooden floor or wallpaper and control the damage to a minimum.

Step 2: First-aid repair after the weather clears "Indoor side-blocking waterway construction method"

About 3 to 5 days after the wall has dried after the typhoon, it is the best time to carry out partial repair. If the budget is limited or exterior wall construction is temporarily unavailable, the water, electricity and waterproofing master will first remove the aged and cracked caulking at the junction of the indoor window frame and the cement wall. Use a utility knife and scraper to scrape it off thoroughly, then use stain removal oil to degrease and dust the surface to ensure it is completely dry. Then apply "single-component polyurethane caulking agent (PU)" or mildew-resistant and weather-resistant neutral silicone. When applying, a special scraper must be used to forcefully press the silicone into the gap to ensure that it is tightly bonded with the aluminum and cement base to form a continuous waterproof plug waterway defense line without holes to block the intrusion of wind pressure and rainwater in the future.

The third step: Shuangbei high-standard radical cure plan "Exterior wall high-altitude crane structure waterproofing and waterproof grouting"

To completely cure the window frame leakage, indoor repair alone is not enough, you must start from the outdoor facing surface. Professional waterproofing root repair projects in the greater Taipei area will dispatch aerial cranes or spider rope technicians to remove deteriorated silicone and pulverized cement around outdoor window frames. Next, a high-penetration primer is sprayed to enhance the strength of the base, and then high-quality "anti-UV modified silicone (MS polymer caulking agent) for outdoor use" is applied. If there are honeycomb structures or hollow cracks in the concrete around the window frame, the waterproofing master will also perform "high-pressure pouring of rubber polyurethane foaming agent (injection method)" from the indoor side to fill the tiny gaps inside the structure. In decoration design or commercial flip properties, completing high-standard waterproofing of exterior wall window frames is a necessary value-preserving strategy to improve the asset's disaster resistance level and ensure that the lease contract will not be interrupted by wind disaster.

The latest standards for catching leaks and regulatory responsibilities in Shuangbei collective housing (2025-2026 practice)

According to Article 10 of the "Apartment Building Management Regulations" of the Ministry of the Interior and the trend of civil water leakage judgments in Shuangbei District Court in recent years, most water leakage disputes in old collective housing focus on the identification and definition of "exclusive parts" and "common parts". The roof platform and the public pipes are jointly owned by all separate owners, and the repair costs should be shared by public funds or all residents in proportion to their shares according to law; if the water supply and drainage pipes inside the floor slabs on the upper and lower floors are damaged, the pipes will be borne exclusively by the users or shared by the upper and lower floors.

At the engineering and technical level, modern professional leak detection has fully introduced non-destructive scientific testing, including "FLIR high-resolution infrared thermal imaging camera" (locating temperature difference leakage paths), "high frequency moisture meter" (measuring the moisture content of deep structures) and "pipeline air pressure and water pressure pressure test" (determining whether hot and cold water pipes are leaking). During construction, do not directly apply elastic cement or oil-based paint on the wet cement layer to seal it. Otherwise, the thermal expansion of internal water vapor will quickly cause the coating to blister and peel off, resulting in more serious powdery wall cancer. The standard construction method must first completely eliminate the water source, wait until the moisture content of the cement structure drops below 8%, and then apply the negative pressure resistant silicic acid permeability crystallized waterproof layer.

Recommendations on independent certificate storage and compensation process for water leakage repair

1. Take photos and videos as evidence immediately: Use rulers to record the leakage range, frequency of water discharge, direction of water mark diffusion, and keep time stamps.
2. Written notification and coordination survey: Officially notify the neighbors through the management committee or a certified letter, and agree on a professional third-party leak detection and appraisal unit recognized by both parties to conduct an on-site survey.
3. The contract states the warranty terms: When signing the contract for the project, be sure to clearly specify the waterproofing warranty period (usually 1 year for partial repairs, and 2 to 5 years for the whole room or roof re-construction), and specify the water test acceptance criteria (such as a 48-hour water storage test in the bathroom shower area) to protect your own asset rights.