On the properly installed metal roof, penetrations are flashed with matching metal. “If a sealant is used, it’s as the main line of defense, even so the true h2o tightness comes from the flashing layout and how it channels h2o off of the roof,” Miller claims. I informed Michael from https://beausldzq.kylieblog.com/22507317/roofing-for-outdoor-sheds-and-workshops-fundamentals-explained