Construction
Rafter Count Calculator
Roof length and rafter spacing give rafter count per side.
Rafters per side
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- Both sides
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- Ridge board (LF)
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- Collar ties (each side)
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FAQ
16 OC vs 24 OC? +
24 inch OC is common for rafters with 2x8 or larger. 16 inch OC for heavier loads or longer spans.
What is a collar tie? +
A horizontal tie in the upper third of opposing rafters to prevent ridge spread.