Structural · IBC 2021 §1805.4 / §1805.4.1
Basement Floor Base Course and Perimeter Drain
Basement section: floor slab over a 4 in gravel or crushed stone base course (10% max passing the No. 4 sieve) with a perimeter drain and dampproofing; exception for well-drained soils.. Referenced to IBC 2021 §1805.4 / §1805.4.1.
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