If placed on exterior walls it will have aluminum foil backing acting as a vapor retarder. Wallboard is resistant to fire and can be installed in dual layers creating a soundproof barrier. The panels are heavy and you will need help moving them about, otherwise it is easy to set up. You can purchase the board in thickness of in. The most normal width is 4-ft.
Cement based backer board is used under tile around bathtubs or shower stalls.
However its surface may be painted or covered with a vinyl covering which will make cleaning easier. This has tongue and groove edges, provides protection against water and wind, and supports framing. This is used under outside siding, masonry veneer, stucco, and shingles. Wallboard sheathing and water-resistant wallboard will bend if applied to ceilings. For ceiling projects use standard, on kitchen, bathroom or laundry rooms, and coat with primer to make it resistant to water.