Site / Grading / Stormwater · IBC 2021 §1805.1.1
Basement Story Above Grade: 25 Percent Perimeter Test
Plan and section of a basement counted as a story above grade plane: where ground is below floor level for 25 percent or more of the perimeter, dampproof and drain the below-ground part.. Referenced to IBC 2021 §1805.1.1.
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