First window installed in the main house. Woohoo an celebration time. See that tape around the bottom? Its another layer of weather protectant. Bob put the window seal tape at the bottom of the window sill and will add another layer on the outside. These are the commercial grade widows we bought off Craigslist for about 30% of the retail price. These are the heaviest windows he and the boys will have to lift. soooo glad we had three boys, love them and appreciate their muscles.