I don’t know about that. Eastern Washington got a lot of ash from Mt. St. Helens and they’re not dealing with “cement” over there. I’ve been up to Mt. St. Helens many times now and it’s not that way with the ash.
I was out there before it blew ... at those camp-out parties where everyone was just “hanging around” waiting for it to blow. Fortunately I wasn’t there that particular Sunday morning.
/johnny