Big_Jake wrote:
I was being vague about "water-resistant wallboard" because code
varies. If DensArmor is OK in your area for damp areas, I'd use that. I
wouldn't use it, or greenboard either, in a wet area like a shower or
tub surround, even though lots of people do. I've repaired too many
tiled walls with rotted wallboard behind.
I have seen greenboard with mold on it so many times that I wonder
what is different about it besides the color. Thanks for the
clarification.
JK
Gold BondŽ BRAND MR (Moisture-Resistant) Board is a specially
processed gypsum wallboard with the core, face paper and back paper of
MR Board treated to withstand the effects of moisture. The facing paper
is colored light green to make it distinguishable from regular gypsum
wallboard.
BASIC USES
MR Board can be used as a tile backer board in dry areas or areas
with limited water exposure such as toilet/sink areas and areas above
tile in tubs and showers. MR Board may be extended beyond the area to
be tiled. A tapered edge is provided so that joints can be treated
in the normal manner.
MR Board is applied in the same way as regular gypsum wallboard
except that during the installation of the panels, water-resistant
tile adhesive is applied to all cut or exposed edges, utility holes
and joints, including those at wall intersections.
http://www.nationalgypsum.com/submit...29%2000-99.pdf
(Thank you mr google...)
The biggest shortcoming in application/installations w/ greenboard is
the failure to follow the recommendations/instructions in the last
paragraph above.
Depending on the brand/product, there may or may not be extra
mildewcides on the paper surface; it isn't surprising if there is
moisture penetration behind the surface covering that mold will form.
--