Thanks. Overall, it appears there are so many curves and pipes that making some
kind of framework would be quite tough unless I wanted to use a VERY large
amount of foam, essentially encasing the pipes and all within.
What I'm starting to think, seeing the prices of the fire rated foam, is to do
similar to what you said; get some 1" or 2" sheets of insulation to apply to the
straightest sections to help flesh out the bulk, and effectively buttering them
on using the Great Stuff. Even SOME countours could be worked around by cutting
smaller pieces of foam sheet and once again applying Great Stuff between....
that way I get a lot of insulation without having to build it up with Great
Great stuff, that "Great Stuff" :D