Answer:
The answer is limited effectiveness! When high-pressure injection technology was first introduced to Taiwan 20 years ago, our technicians were practically one person per machine; however, after thousands of case studies, the success rate was only 3–4%. Therefore, our current policy is: Unless it is a leak control project for the pipe edge or underground construction sites, we will not use the high-pressure injection technology at all! The most common types of window edge wall leak are as follows; high-pressure injection is definitely ineffective:
- The case where the window gap is too large and brick masonry is used to fill the gap.
- Cases where the original window frame was fixed using miscellaneous materials such as wood or cement bags, but the debris was not removed afterwards.
- When the original window frame is sealed with cement, insufficient cement, too much sand, or an improper ratio of water to cement causes the strength to be poor.
In fact, high-pressure injection materials (usually hydrophilic PU foam materials) are divided into materials injected into the wall body and materials injected outside the wall body. The expansion ratio ranges from 3 to 30 times, and the shrinkage rate after drying is also a key factor in whether leakage is prevented or not. The injection method can be divided into open and closed types, each with different effects and functions. Uncontrolled injection not only fails to prevent leakage but also is extremely prone to subsequent problems such as pipe blockage, window deformation, and tile cracking, causing constant disputes.。