Lalo

It's a solid board. I believe it's 4x8. Sort of like this http://insulation.owenscorning.com/homeown...ts/propink.aspx except mine are silver on the outside. You see them at the box stores, big silver sheets about (or exactly) the size of a plywood sheet. Normally used on exterior walls, I guess. So if you go under the crawl space and look up, that is all you see, these silver panels nailed to the joists. At least that's all you saw before they started falling down. Now you can see the joists above them, along with the fiberglass roll insulation falling down. Now they are perfect bridges for termites and mice, etc.

That's actually my inclination. But would it affect my summer AC bills much? I've read conflicting things. Thanks for the quick reply.

Hello! We recently bought a pier and beam house in the country outside Houston. Inspector pointed out that the insulation under the floor was falling; she said it should be a simple matter of nailing it back up. But the house is only 10 years old. There aren't any obvious moisture issues, like standing water, but I wonder why that insulation is falling. It seems like moisture might be a factor, no? They put fiberglass roll insulation between the joists, and then nailed insulated sheathing along the bottom. The sheathing is falling down in places, and the fiberglass spilling out. What should I do? Should I just try to nail the sheathing back up? Remove the fiberglass on the assumption that is collecting moisture and then nail the sheathing back up? Or should I just rip out all the insulation, figuring mold and critters are bigger problems than drafts? I guess I could throw up my hands and call an insulation professional, but I'd prefer to not spend that money. This is a weekend home, so energy conservation is not quite so critical, particularly not in winter. But if having a well-insulated floor would save us $50 a month in the summer, it would certainly be worth getting it done right. Any thoughts?