This is the key information that most companies don’t want to let you in on. Over 95% of all window leaks are due to improper installation. That’s right! In only a small fraction of cases is there actually an issue with your window. In most cases, windows are not installed to industry standards or best practices. In most regions, it isn’t an issue. But here in the pacific northwest, where our homes are bombarded by moisture for six to seven months a year, proper installation is critical.