Has anyone ever heard of fiberglass insulation batts that are 29"
wide? I'm trying to insulate the floor of my 1860 house and I'm
stumped by the joists, which are set 30" OC. I can't seem to find
anything wider than 24", or anything (like rigid foam board) which
could be cut to that width reasonably efficiently.

There are lot of these houses around -- I figure there must a solution
out there. But so far no luck. Ideas?

John