Ok this might be a bit of a weird one but i need to insulate my van after the ply boards are on. now the reason for this is I have bought a van that has already been boarded out and then lined with fibreglass so there is no way of getting them out without cutting them out. I do still need to make a few holes in the van like for a window and some other things which would give me a little access, so should i just try to push sheets of wool that i cut into where i can. thanks for any help