View Full Version : PC LightWise and rough in

Mike Cornelsen
10-06-2008, 10:48 AM
I'm planning to install a vinyl Pittsburgh-Corning LightWise glass block window. P-C's nominal rough in is 40 15/16 x 33 3/16 for a 40x32 window. For wooden windows, a larger rough in is needed but I read that vinyl windows can be roughed in to size, say 41 x 33 1/4 in this case. Is this proper or go ahead and add oh, 1/4 or 1/2in on all 4 sides? I'd also be interested in any feedback, tips, tricks or warnings other Creeker's might have from their experience in installing LightWise windows. Thanks!