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Bay window roof geometry
Viewed in plan, that is from directly above, the hips should bisect the angle formed by the front wall and the wall adjacent that dies into the house.
The common error
- Correct
- Each hip bisects the angle between the front wall and the adjacent wall, so both roof planes carry the same pitch and the intersection with the house is shorter than the front wall.
- Incorrect
- The hips are placed at the corners at 90° to the front wall. That creates an intersection with the house equal in length to the front wall, which forces two different pitches into the structure, and it looks wrong.
More bay window roofs are framed this way every year. The concave hip and regular hip window roofs are prefabricated to the correct geometry, so the pitch is consistent by construction rather than by site layout.
Categories: Window roofs