How Is a Door Frame Made?
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Measurements
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Measuring is the first thing that is done when it comes to making a door frame. Measurements will vary depending on the type of door to be fitted in the door frame. The measurement of the door plus 1 inch on the top and 6 inches on both sides is a general rule for measuring the size of the frame. A 2 by 4 or a 2 by 3 is measured then laid at the base of the door frame to act as the frame's "shoe," providing a base for the studs. The studs are the 2 by 4 oieces on either side of the door that are set upright against the wall (the sides of the door frame); these are measured than set up, forming both sides of the frame. Finally, a 2 by 4 is measured and laid across the top of two studs; this is the top, or "plate," of the door frame.
Header
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There is still a space between the top of the door and the ceiling. This is called the header. To complete the header, two 2 by 12 pieces are typically measured and cut to matching length--the same width as the original door opening. These are nailed together, then placed face down across the top of the door frame's plate and nailed in place. Three half-inch spacers--typically of plywood--are then fitted, upright, between the 2 by 12 pieces and the ceiling, two on the sides and one in the middle. This can then be covered by drywall.
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Knob and Hinges
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The last step in the process is preparing of the knob mechanism and attaching of the hinges. The knob mechanism is what will allow the door to click in place when it is closed. Its place on the door is measured after which it is secured into the frame at the appropriate height to match the door. The hinge spots along the side of the door are also measured then secured along the other side at the appropriate places.
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