NCBC RAFTER MATH CALCULATIONS BUILDER A SCHOOL

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Last updated 12:48 AM on 6/10/26
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10 Terms

1
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STEP ONE RAFTER MATH FORMULA

SPAN / 2 = TOTAL RUN

2
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STEP TWO RAFTER MATH FORMULA

PYTHAGOREAN THEOREM - RISE² + RUN² = BRIDGE MEASURE

3
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STEP THREE RAFTER MATH FORMULA

BRIDGE MEASURE X TOTAL RUN = RAFTER LINE LENGTH

4
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STEP FOUR RAFTER MATH FORMULA

BRIDGE MEASURE X PROJECTION = TAIL LINE LENGTH

5
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STEP FIVE RAFTER MATH FORMULA

DROP” X 2 / UNIT OF RISE = COLLAR TIE LINE LENGTH

6
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STEP SIX RAFTER MATH FORMULA

UNIT OF RISE X TOTAL RUN = TOTAL RISE

7
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STEP SEVEN RAFTER MATH FORMULA

TOTAL RISE + THICKNESS ABOVE BIRD’S MOUTH = HEIGHT OF RIDGE BOARD

8
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STEP EIGHT RAFTER MATH FORMULA

UNIT OF RISE IS TO UNIT OF RUN AS X IS TO 16

9
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WHAT TWO STEPS ARE PRESENTED IN FEET?

1 & 5

10
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WHICH TWO MEASUREMENTS ARE ALWAYS IN FEET

TOTAL RUN & PROJECTION