The Building Code Blog
2015-2018 IBC Frontage Calculator
Segment Segment Length Segment Width Counts for Frontage?
(ft) (ft)
A
B
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D
E
F
G
H
I
J
K
L
M
N
O
P
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R
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Item IBC Reference Value
Total Perimeter (P) -
Total Perimeter fronting open space of 20 feet or more (F) -
Weighted Average of Frontage Width (W) Equation 5-4
Frontage Increase Factor (If)
If = [F/P-0.25]W/30 		Equation 5-5