We are planning to change the windows in our bedroom. We are going to take out the old crank casement type and replace with new double hung vinyl. The new windows will be bigger. My question is the measuring of the rough in opening. How much larger is it then the actual window. Example; If the new window we want is 40 height by 52 width what would be the rough in opening.of 2x4 frame. Thank You.
Most manufacturers vary their r.o width requirement somewhat however you would probably be okay if you added a 1/2" to your width and heighth. That would give you aprox. 1/4" all the way around to align/shim/etc.
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