Many installation problems begin with the fact that someone didn’t order the right size window in the first place. To save money, some companies will order a “standard size” that isn’t sized correctly for the opening. So what does the installer do? window and door installation He “makes it fit.” The result is an ill-fitting window, that will most likely have problems with air and water infiltration over time.Then, there is the infamous “Rip Stick” installation. There’s a reason windows come with nail fins; they prevent air and water intrusion. Some companies elect to rip off the window fin (flange) and stick the new window in with screws to save time and installation costs. They secure it with screws, add a whole lot of caulking, and call it a window installation. (It’s not a good one.) Also known as a “glue screw,” this type of installation results in long-term problems.