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Two different beasts... Mold Resistant; 1/2" thick board, ceiling framing only at 16"o.c., never 24". 5/8" will go 24". with a water-based finish.
Green board, 1/2"; ceiling framing only at 12"o.c., need 5/8" for 16"o.c. 24"o.c.--- use another product. I'd use lightweight 1/2" spans (24"o.c.) equal to 5/8" for anti-sag, and insulation weight loaded above (2.2#).

http://www.usg.com/rc/data-submitta...gular-and-firecode-cores-submittal-WB2390.pdf

http://nationalgypsum.com/products/..%5CFile%5C1046.pdf

Post #6; http://www.diychatroom.com/f101/drywall-above-shower-170011/

Gary
 

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Mold!! Let's kill it!
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Not all greenboard is mold resistant. Moisture resistance and mold resistance are two different things. Ask for a "cut sheet" where you buy it and read the specs. Mold resistant drywall is typically moisture resistant by nature, but not the other way around.
 

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It is my understanding they are doing away with the greenboard. I guess phasing out would be a better term. So what is out there now is just the remaining stock they are getting rid of.
 
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