Hello Gents:

I’m on board with Gunnar. It is probably lime, and I too have seen it spread after a sewerage leak.

My opinion: BAD IDEA!

Fascinating to think that homeowners freak out upon learning of the presence of harmless mould in their crawler, but don’t seem to be bothered about the presence of a particularly nasty compound (calcium hydroxide). Whereas I would not necessarily recommend the removal of mould from a crawlspace, I would definitely recommend abatement of this hazardous material from a crawlspace.

But that’s just me. Others may disagree!

Cheers!
Caoimhín P. Connell
Forensic Industrial Hygienist
Forensic Industrial Hygiene

(The opinions expressed here are exclusively my personal opinions and do not necessarily reflect my professional opinion, opinion of my employer, agency, peers, or professional affiliates. The above post is for information only and does not reflect professional advice and is not intended to supercede the professional advice of others.)

AMDG