If the rough opening measure is too small, the window you order might be too big for the window opening and that will mean you'll need to adjust that opening or wait and order a new window all of these situations will cost time and money. A rough opening that's too big means you've got a lot of gaps to fill around the window and that can result in lots of air leaks around the window. The more accurate the rough opening measure, the better. The rough opening refers to the measurements of the opening in the wall that the window or door will be placed into and it is in fact different from the actual size of the window. The order form for the windows will tell you if you need to provide the net frame size. These two simple steps will tell you the approximate rough opening for the window. Take the smallest of these measurements and this is the rough opening height. Measure the vertical distance from the bottom head jamb to the top of the window sill at the left, center, and right side.For instance, a bolt size of 5.9 mm is referred to as a 6mm thread. Take the smallest of these measurements and this will be your rough opening width. The thread sizes are given in nominal sizes, not actual measurements. Take three measurements one at the top, center, and bottom. Measure the horizontal distance across the frame from jamb to jamb.To measure for the rough opening in replacement applications follow the steps below. Still, you can measure the rough size of your window. In the case of a new window, the space within the frame of a window is open and can be easy to measure. The window has sheetrock which fills the entire middle region of your window. The rough opening for new construction will be similar to one in a replacement situation.īut there's one problem with getting the accurate rough opening size of an already existing window that needs to be replaced. Is the rough opening different in new construction vs replacement situations? If the rough opening is framed before ordering your windows, then you'll know you need to order windows smaller than the rough opening. When windows are ordered before the framing begins, knowing the net size of the window frame will help your framers plan how to frame the rough opening. This situation sometimes comes up in new construction projects. What if you already ordered windows and now you need to calculate the rough opening size? In this situation you just take the size of the window and add the recommended amount of space, usually, half an inch so that there is 1/4" of space on each side. This is just a simple example of a pretty standard rough opening measure recommendation. Be aware that rough opening recommendations may change depending on the manufacturer. How do we arrive at this? The half-inch is subtracted from the width and the height of the window leaving 1/4" of space on each side. For example, if you order a quality casement window with an opening size of 60 inches by 50 inches, here's what the actual size of that window will be A rough opening is typically a half-inch size larger than the actual size of a window. A rough opening and the actual window size are different.
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