Window Rough Opening Calculator
Window Rough Opening Calculator . Enter known dimensions into the sizing calculator below to calculate additional dimensions including unit size, rough opening , casing size and masonry opening. Standard door heights are 6/6 (78) and 6/8 (80). WDMA Standard Window Sizing Tool v1.0 China Windows and Doors from www.wdma.com.cn The calculator can also account for any profiled casing size. Shim space and sealant gap can be set to your project's requirements. To determine the rough opening width measure the interior dimension as illustrated.