In window sizing, which designation appears first?

In window sizing, which designation appears first?

• A. Rough Opening
• B. Frame Height
• C. Glass Width Size
• D. Frame Width

Answer: (C)

The most important idea here is that window sizing starts with the glass width because the glass pane is the defining element of a window unit. The glass size sets the actual opening that will carry the pane, and from that starting point the frame dimensions are built to enclose that glass. Once the glass size is fixed, the frame width and frame height describe the surrounding frame that holds the glass and sash, including any glazing beads and hardware. The rough opening is the larger space in the wall that the entire framed unit must fit into, allowing for installation clearances, shims, and weatherproofing. So the glass width size is listed first because it represents the primary component the unit is made around; the other measurements describe the surrounding frame and the wall opening.

The most important idea here is that window sizing starts with the glass width because the glass pane is the defining element of a window unit. The glass size sets the actual opening that will carry the pane, and from that starting point the frame dimensions are built to enclose that glass. Once the glass size is fixed, the frame width and frame height describe the surrounding frame that holds the glass and sash, including any glazing beads and hardware. The rough opening is the larger space in the wall that the entire framed unit must fit into, allowing for installation clearances, shims, and weatherproofing. So the glass width size is listed first because it represents the primary component the unit is made around; the other measurements describe the surrounding frame and the wall opening.