> Unless you are maliciously incompetent as an installer there is no risk of destroying anything. It's actually quite easy to accidentally create a leak with v

> Unless you are maliciously incompetent as an installer there is no risk of destroying anything. It's actually quite easy to accidentally create a leak with various common roof systems. It's often quite easy to fix the mistake when it's made. But the mistake is not always noticed, and the work is not always done by competent and experienced people. There doesn't need to be anything malicious about it. Part of my day job is fixing those mistakes.