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  2. Projection Wall Angle. Projection Offset = ( Back Wall Length — Face Wall Length ) ÷ 2 Projection Wall Angle = arctan ( Projection Offset ÷ Projection ) Example with CMC back wall = 8’ - 0’’ face wall = 4’ - 0’’ project ion = 24’’ projection offset = 24’’.

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  3. To Calculate a Bay Roof. Select Bay Window Roof from the dropdown list or select the Bay Roof button on the toolbar to calculate a bay roof. The preview window displays a plan view and elevation view of the bay roof that reflect the current bay dimensions.

  4. Projection Wall Angle = arctan ( Common Rafter Run ÷ Projection Offset ) Interior Wall Angle = ( 90° - Projection Wall Angle) + 90° BHRR Bisect Angle = Interior Wall Angle ÷ 2

  5. For existing openings, measure the jamb of a nearby door or window within the same wall. Measure only the face of the existing jamb, inside-casing to inside-casing. Determine "P" dimension (Projection). Viwinco makes 10 degree, 30 degree, and 45 degree bay windows.

  6. Projection Charts for Bow and Bay Windows (18 degrees to 45 degrees) . (30 degrees to 45 degrees) . Note: Add projection and wall thickness together to determine total unit depth.

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  7. This bay window rafter script will print out a chart of all rafter lengths and angles for the baywindow. The starting pitch is 3/12 and the ending pitch is 16/12.

  8. In this video, Rick Arnold shows us his simplified method for laying out and building a bay roof. You won’t need to know a lot about roof framing, and you can adapt the techniques to any 45-degree bay window.

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