A.Bill Campbell and Charles Jennings respond: Crawlspaces can work well whether vented or not. However, in warm, humid areas such as the Southeast, we wouldn’t recommend the non-vented approach unless good construction practices are rigorously followed.

In all cases, you should install a ground cover. With a ground cover, a vented crawlspace should have at least one square foot of free vent area for each 1,500 square feet of ground area. There should be at least four vents well spaced from each other — usually near the corners. Ideally they should be placed with two on the side of the...

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