BUT....Curiosity got the best of me ( a trait I am sure many DIYers share with me) and I just had to know what was up there.
It started with just one tile, which I soon discovered was stapled to 1x4 wood boards and they were very easy to pull down...
I could see the old plaster ceiling up above and it looked in decent shape, so we kept pulling tiles down. (my nephew was happy to help!)
My almost bro-in-law was kind enough to climb up and scope things out for us last night. It looks like the insulation IS sitting on the plaster. So that means it will all come down when we remove the plaster. He also discovered the original exerior of the house is still up there as well...siding and all. So opening the ceilings just got a bit more complicated (not that is wasn'tt already). We knew the main living room was an addition in the 50's but weren't sure exactly how they had done it. It also explains all cracks in the plaster on the walls and on the ceiling. Fun fun.