24 Sep '13, 1pm

What to do about gravel crawlspace floor? #green

Question is about a house in the northeast--cold winters, humid, raining summers. It was built around 22 years ago. Most of the house is above a 500 sq foot crawlspace, about 5.5 feet in height. The rest is a connected walk-out basement that was added as part of an addition to the upstairs. A gas boiler (for heat) and electric water heater are located in the crawlspace. The crawl space has a couple of vents (I haven't closed them off because of the gas boiler). The floor of the crawlspace is loose stone gravel-rather chunky pieces not the usual stuff you see in yards. Underneath the stones is a old layer of clear plastic. During a rainy period in the summer, the humidity in the basement/crawlspace soared to over 80%. The gravel floor in the crawlspace had a large blotch of wetness, almost a perfect square around 4' on a side. I put in the largest portable dehumidifier I co...

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