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Home >> Builder Resources >> Vinyl Windows: How To Obtain Rough Opening Size To get a rough opening of a single window, add 1/2" to width and height of call out size. Example: 3050 single= 36-1/2"x 60-1/2" To get the rough opening of a continuous head and sill window use call out size of width and add 1/2" to height. Example: 3050 Twin Uniframe= 72"x 60-1/2" To get the rough opening of any other combination unit, add 1-1/8" per mull and 1/2" on width and height. (Only add the 1/2" one time to width) Example: 3050 Triple = 36"+ 1-1/8" + 36"+ 1-1/8" + 36" +1/2" = 110-3/4" (width) x 60 - 1/2" (height) |
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