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Ground cover material in Crawlspace


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50's house with this material in the crawl. It was brittle and like cardboard. It has just plain dirt (no gravel) on top of it. Is this some kind of moisture barrier?

Top (Black Color)

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Bottom toward the ground (Brownish color)

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Thickness

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It looks like at one time it covered the whole floor. It breaks apart when the exposed stuff is crawled on. A furnace, duct work, refrigerant lines are installed right by the crawlspace hatch, so I didn't even notice this stuff until I got further into the crawl.

Felt did came across my mind, and 30 lbs would make sense, because it seems thicker. I only noticed overlapping seams, and the more I tried to expose the more it broke apart; but it looked like the width would be like 4'-5'.

Either way it needs a better vapor barrier.

Frank

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I enjoy learning about old building materials and methods. When I see something different, more than a few times, I just get curious. I'm fortunate to have resources to find out stuff.

I once saw specs (I think it was for a building in the early 30s) that specified Ruberoid for a crawlspace.

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