Originally Posted by
Gunnar Alquist
Vern,
I have seen lime used under homes after a sewage spill. I have never tasted it, so I don't know if it is salty. Ron's guess on DE might be more accurate.
Yes, you are going to die. We all are. Hopefully not today though.

I've spread lime before and it isn't lime.
Thanks to all for the input, sorry to hear I'm going to die though. I have always been hopping for immortality

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Owner is out of town so without knowledge of what it is this is what went in the report:
A white powder substance was found on the surface of the vapor barrier throughout the crawlspace. The powder is a respiratory irritant and will prevent entry for maintenance and repair. Recommend inquiring with the seller to identify the material. Recommend removal of the powder to allow maintenance and repair of the furnace and air-handler.