Another couple of comments, I hadn't even thought about the foam although I have about 3 cans on hand in my "Conversion" equipment box. I think I'll get a few more cans of the foam--Thanks for the input.
The weight of the shielding materials in the attic are already up there. The weight is too little to be a problem in this case. The amount of shielding is minor and is more of a case of redistributing existing materials in a different manner so as to provide a little extra protection. I hadn't actually considered this aspect and you have given me a reason to look at the attic from a fresh POV. I'm still safe! Thanks!!!