The Art of Measuring For a Perfect Glass Doors
It is important to take precise and accurate measurements of the entrance opening, starting with the net frame height to determine the opening level to the highest point of the elevation.
Cross check the measurements from several points and note the storefront fame width and width of the rough opening at top middle and bottom.
Always make sure that the storefront components are installed plumb, level and true, in compliance with the manufacturer’s installation instructions, contract and construction documents.
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I think this is good advice. But you could always call a professional contractor to replace the door for you. I got mine locally by a company near dallas called conservation construction of dallas. They did a great job on my sliding glass door.