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When framing for a window in a new location, it is usually easiest to cut an opening in the interior drywall that is quite a bit larger than the window opening. This will require you to patch the walls afterward, but installing framing—especially the header—inside a wall is difficult. It is also usually easiest to leave the exterior sheathing and siding in place while you cut the studs and build the framing. This prevents having to replace siding. However, if you will be replacing the siding anyway, you can cut a large opening in the exterior at the same time you cut the interior opening. If the window has brick molding or a flange, you will need to cut back the siding to accommodate it. If you have a brick wall, hire a professional mason to cut an opening. When framing always work carefully to produce a structure that presents a smooth face for the drywall. Install adjoining pieces perfectly flush with each other. Expect to spend a full day on this project—you'll need to remove interior drywall and create the frame. Though it looks daunting, this project is fairly simple. We recommend DIYers have experience measuring, marking, and cutting before attempting to frame. Instructions
What size should I frame my rough opening?Framing rough opening sizes are really quite simple. Just add 2″ to the width of the actual door size. You should add 2-1/2″ to the height of the actual door. This will give you room to space the door frame off of the sub-floor.
What is a rough opening in a wall?Rough opening (RO): Framed opening into which a door or window fits. Plate: Horizontal framing members at the top and bottom of a wall that the studs nail to. Jack stud: Vertical framing members that flank each side of a rough opening and support the header.
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