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Even homes with so-called 'dry' crawl spaces should have this done (and make sure to permanently seal off all the foundation vents). I used to investigate a lot of structural damage from crawl space moisture - the largest moisture source in nearly every building. Many times, someone would point out that their crawl space has dry sand. OK, great. But sand is porous and if you dig down a foot or 2 you will eventually hit wet sand (unless you are in an area that has several feet of well-drained natural sand and no groundwater problems.) And that moisture vapor travels freely up thru the sand, and into the crawl space, living space, and attic.
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