Q:

Fiberglass batts: how to cover the exposed paper?

I need to install fiberglass batts under my (raised) house. I have read that the paper should generally face the warm side, so it depends on where one lives. I live in South Louisiana, so I plan to place the batts with the paper facing outside. But there are clear instructions on the cover of the insulation packs that say that the paper should not be left exposed, so it will need to be covered, but with what? 

A:

At the least i would cover it with 1/4" plywood. At the most I would cover it with 4X8 sheets of cement board. Depending on the moisture present under the home, would temper the choice further.

