Midrexâs primary business is direct reduction ironmaking. We build DRI plants that work day in and day out, year after. year to provide value for our clients so that they can make. the most of their investment and maximize their profits for. years to come. The MIDREXÂ® Process 2. The MIDREXÂ® Process.
Quick Answer. The maximum interior height of an entry door threshold is 1/2 inch, and up to 3/4 inch on exterior siding doors where it is essential to keep water out, as stated by the United States Access Board. These height limits improve wheelchair access to buildings.
The standard height for a US door is 6'-8, or 80. When framing in a rough opening, a good rule of thumb is to allow 2 extra in height and 2 extra in width. This gives you enough room to adjust the head to be level, allow for flooring, and to shim the jambs plumb. Feel free to e-mail me if you have any questions.