A note in the plans says " 6" porous material" for use under slab.
What is the reasoning behind this?
What constitutes a porous material? 3/4" crushed stone? other?
Does anyone have a copy of the ARC (Associated Rockery Contractors) Rock Wall Construction Guildelines? Dated about Nov. 1992?
I have found a lot of reference to it, but can't find the actual document.
Thanks in advance.