Lol. Nice Fred. I'm glad you chimed in as I've been 90% commercial for a a while now. I enjoyed residential. Lally (lolly?)column/support pole. The hollow pole. If it is filled with concrete it is likely on a footer. That's all that meant. But that point is now moot anyway. Just tell the company what r value you want and they give it. I think 2 inches = typical r-13. Diff spray companies may handle it differently. That's an easy one to ask over the phone though. And the ceiling is more for insulation and sound than vapor anyway. I really don't think nails coming through would be an issue. I guess it depends on the AC setup. Or just grab those nippers and get cutting! Seriously any prep work u do for anything anytime will always benefit you. I really do love this aspect. Can't ya tell? The brainstorming/problemsolving and putting a plan together.