Question 5
Domain 1: Footings, Foundations, and CrawlspacesWhat protection is required for wood framing members that are less than 8 inches from exposed ground in crawlspaces?
Correct answer: C
Explanation
Wood framing members in crawlspaces that are less than 8 inches from exposed ground must resist decay because of the moisture exposure. The rule requires they be "naturally durable or preservative-treated wood" for that location.
Why each option is right or wrong
A. No protection needed if ventilation is adequate
B. They must be covered with building paper
C. They must be naturally durable or preservative-treated wood
IRC Section R317.1 requires wood framing members located in crawl spaces and within 8 inches of exposed ground to be protected against decay by using naturally durable wood or preservative-treated wood. The 8-inch clearance is the controlling threshold here; if the member is closer than that to exposed earth, ordinary untreated framing is not permitted because the code treats that location as decay-prone due to moisture exposure.
D. They must be coated with asphalt paint