There is a whole slew of photos & explanation of the process but I can't find them. I will check with the friend who sent me them before & see if she can rummage that back up. It's sprayed with gunite, sort of a spray on concrete. June, send me a Treemail reminding me & that way if I forget, you will be my post it note.
If she can find the info. again I will post it here.
Ann
PS I'm sure that with all that's new these days you could find a way to make the noise issue inside not be such a problem. Maybe use something like that open cell spray foam insulation.
