The short answer
Bay windows commonly form sharper angled planes with fewer main units, while bow windows commonly use more units to create a gentler curve. Compare projection, support, roof or cap, flashing, glass, operable units, interior finish, exterior access, and the existing opening.
- Document geometry and projection.
- Identify fixed and operable units.
- Require support, water-management, trim, and finish scope in writing.
Sources
Sources
- Window Installation — U.S. Department of Energy
- Window Energy Performance Ratings — National Fenestration Rating Council