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Unread 10-29-2008, 11:39 AM   #8
Tile newbie
Join Date: Oct 2008
Location: Milwaukee, Wisconsin
Posts: 30

Your reply of:

4. Regular drywall on the ceiling. Half inch would be fine unless you need the extra thickness if there is no soffit to separate the shower ceiling from the bath ceiling. Greenboard is NOT stiffer, it's actually not as stiff. Greenboard should be applied to ceiling joists spaced 12" o.c., reg. wallboard can span up to 24".

is contradicted by these USG tech sheets. Compare the Mold Tough vs. Gypsum.

USG Mold Tough

Regular Gypsum

In my application, I will be installing the sheets perpendicular to the ceiling joists. Both Mold Tough & Regular in 1/2" or 5/8" are all spaced at 24" OC max.

Based on those numbers, my question remains if it makes sense to use the Mold Tough, 1/2" or 5/8" on the ceiling since that will be the most moisture ?

It's only weird because it's not normal.

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