According to Hawaii building code, what is the minimum height requirement for crawl space foundations in flood-prone areas?
Correct Answer
C) 18 inches
Hawaii building code requires minimum 18-inch crawl space height in flood-prone areas to allow water flow and provide access for inspection and maintenance.
Why This Is the Correct Answer
Hawaii building code requires a minimum 18-inch crawl space height in flood-prone areas. This height allows floodwater to flow through without creating uplift pressure that could damage the structure, while also providing sufficient clearance for inspection, maintenance access, and utility installations.
Why the Other Options Are Wrong
Option A: 12 inches
12 inches is too low for flood-prone crawl spaces. This height restricts water flow, prevents adequate inspection access, and may not provide sufficient clearance to protect utilities and structural elements from flood damage.
Option B: 24 inches
24 inches exceeds the minimum requirement. While a 24-inch crawl space provides more clearance and better access, the question asks for the minimum, which Hawaii code sets at 18 inches for flood-prone areas.
Option D: 30 inches
30 inches significantly exceeds the minimum and would represent over-building beyond what code requires. This height is not the minimum standard; requiring it as a minimum would unnecessarily increase construction costs.
Memory Technique
Think '18 inches = 1.5 feet = crawl space to keep water moving.' The number 18 is easy to remember because it equals the standard 6-inch increment after 12 inches — one full foot is not enough, so Hawaii adds half a foot more to get 18. Visualize crawling on your elbows with 18 inches of clearance — tight, but functional for inspection.
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