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Greenboard Drywall
Greenboard Drywall Should not be used in Wet Areas
By Mark J. Donovan
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Contrary to what you may have heard
greenboard drywall is not meant for wet environments. Many do it yourself
homeowners often make this mistake and wind up using it in a custom ceramic tile
shower stall or shower surrounds. Cheap builders also sometimes try to get away
with using it in ceramic tiled shower areas. This is a major error and will
quickly lead to a failed custom ceramic tile shower project and rapid mold
growth! Greenboard drywall is meant for damp or high humidity areas, such as
bathroom and basement walls, but not in wet areas such as in shower stalls.
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A more appropriate naming convention
for greenboard drywall is moisture resistant drywall.
As the name implies greenboard drywall is green in color due to the green paper
that is used to sandwich a layer of gypsum material between it. The paper
covering is water resistant but not waterproof. As soon as water penetrates the
paper covering the gypsum quickly breaks down and crumbles.
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Consequently greenboard drywall should never be used
in shower stall applications or other wet tile
environments. Cement backerboard or Hardibacker
board should be used instead for ceramic tiled
shower stalls or other wet areas that are to include
tile.
Greenboard drywall comes in two thicknesses, ½ inch
and 5/8 inch, and is available in a variety of sheet
dimensions including 8, 10 and 12 feet lengths and 4
feet widths. Pricing varies with sheet size and
market conditions.
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Though greenboard drywall is available in 5/8 inch thickness it should not be
used in firewall applications. Instead Type X drywall should be used for these
types of applications. So before choosing moisture resistant drywall make sure
the target environment is truly a damp or humid area, and not a wet or potential
fire area.
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How to Repair a Large Drywall Hole Ebook
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Backerboard and Greenboard Drywall Articles
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