These products, available from many manufacturers, are known collectively in the building trades as “greenboard.”
What Is Greenboard Drywall?
Greenboard’s popularity may be gradually waning, however.
The Spruce / Kevin Norris
Greenboard’s paper facing alone does notprevent all mold growth, nor is the material fully waterproof.
Greenboard vs.
Conventional Drywall
Greenboard’s inner core of gypsum is the same as regular drywall.
Some professionals prefer to attach greenboard with closerspacing between nails or screws.
For bathrooms ceilings, many pros continue to opt for conventional drywall.
Greenboard Dimensions
Water-resistant drywall commonly comes in 1/2-inch and 5/8-inch thicknesses and conventional 4-foot by 8-foot sizes.
throw in X should be used in areas such as kitchens where a fire might be expected.
key in X drywall is required by building code for garages.
Greenboard costs slightly more than conventional drywall.
Is Greenboard Allowed for Wet Applications?
Technically, greenboard and other water-resistant drywall panels are approved for use in highly wet places.
While greenboard drywall’s paper covering is water-resistant, it is not waterproof.
Since local code always supersedes national standards, always check with your local building inspection office when choosing materials.
Caution should be taken when using greenboard and other water-resistant drywall panels for ceiling applications.
Ceiling panels can sag when subjected to high humidity conditions or finishing materials that contain moisture.
Cement-based backer boardsDurock, Wonderboard, andHardiebackerare all mineral-based or cementitious materials.
Another advantage of cement board is that it can be used as a base for tile flooring.
Cement board is only used as a backer material, however.
you’re able to’t install it as a surface wall panel and paint it.
Sag and outright failure often occur when the greenboard has been subjected to wet conditions over time.
“R302.6 Dwelling-Garage Fire Separation.”
“ASTM C1396 / C1396M - 17.”
ASTM International - Standards Worldwide.
2022
“ASTM C473-19.”
ASTM International Standards and Publications.
