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- First you must figure out the slope of the roof.
- To do this: hold a Framing Square (short end) level from the rake edge of the roof with the (long end)over the edge. From 12" horizontal from the roof, measure down to the deck. This is your slope factor (# x 12).
- Multiply Length by width including overhangs. LIKELY 19' X 83' = 1577 sf
- Multiply the area by the SLOPE FACTOR
- SLOPE FACTOR:
- 2-12 = 1.01
- 3-12 = 1.03
- 4-12 = 1.05
- 5-12 = 1.08
- 6-12 = 1.12
- 8-12 = 1.20
- 10-12= 1.30
- 12-12= 1.41
- Add 10% to 17% for Hips Ridges and waste and starter.
SO: [(16X80)XSF]X0.10= ROOF AREA (100sf roof area = 1 SQUARE)
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