Originally Posted by moosejohnson
Hello, just begining the drywall phase in my bathroom. Starting with the ceiling, I have 16" OC joists and was wondering if 5/8 Green Board was overkill, or can I get away with 1/2 knowing I have 16" OC and a less chance for sag? Also, what screw length should I be using?
Thanks for your Help!
Moisture Resistant Sheetrock (AKA - Green Board & MR Board -around since the 70's), is slowly being phased out. It is being replaced by sheetrock that is also Mold and Mildew resistant, not just moisture Resistant.
As far as what should be used on the ceiling; Manufactures of the older green board used to require 12" O.C. fastening for 1/2" GWB ceiling applications. However, with the new material, this is not required. 16" OC is fine.
Example - Gold Bond XP Board Installation Instruction with fastening table:
1/2" GWB should suffice, dependant on your regional standards. 1/2" Will not sag with 16" OC framing.
Use 1 1/4" Course Thread (for wood) drywall screws. (Fine thread is for steel framing).
If you plan on using actual green board, the spacing should be 1/2" OC for ceilings applications.