Today I was ripping out a set of old concrete steps to make way for new footings and a composite set of stairs.
I know all old stairs are filled with rubble. These were but also they had a bunch of square flu looking objects stacked up in there as fill also. They were about 3.5' long and probly 14-16" wide they had multiple cells unlike a normal flu pipe and were clay material.
I'm thinking it's some sort of flu or something. There was writing on it that said national fireproofing company on it but I couldn't make much of the writing out.
So who's got the answer?