Moisture in Crawl Spaces

Why is Moisture Control in Crawl Spaces So Important?
We all know that crawl spaces can be easily overlooked or forgotten by homeowners. However, elevated moisture levels in crawl spaces can eventually have serious negative effects on the home's structure as well as the health of the people who live there.

Moisture in crawl spaces is a common problem that can contribute to rotted sills and rim joists, mold problems, and insect infestation if not controlled. It has also been associated with health issues that can accompany mold, mildew, and other problem organisms.

What are Some Ways to Control moisture?

There are a number of steps that can be taken to reduce moisture levels in crawl spaces. Some items to consider are:

• Ventilation - Especially in colder climates, crawl spaces should be ventilated to the outdoors to increase air circulation and prevent moister buildup.
• Grading - Ideally, the crawl space grade should be higher than the outside surface grade, and grading around the home's perimeter should always slope away from the foundation.
• Vapor barriers - depending on the climate, using a vapor barrier on crawl space floors will aid in controlling excess moisture.
• Vent wells - Vent wells should be used if the foundation vents to the crawlspace are fully or partially below grade.

Vented or Closed Crawl Spaces?

There has been considerable debate in many areas about the benefits and disadvantages of vented vs. closed crawl spaces. Some building codes, particularly in warm, humid climates, have been moving toward requiring closed spaces. Research continues on this topic at both local and national levels. Homeowners should consult with their local building department to determine current requirements before making a decision on changing their crawlspace specifications.

Article courtesy of Pillar To Post Professional Home Inspection
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