Drywall Ceiling - Which Thickness ?

[malamilia]

I am about to start a ceiling in the basement with drywall. Is there an advantage in using 5/8 in rather than 1/2 in drywall ?? Thanks.

[marson]

typically, 5/8" is used on ceilings because it is stiffer and will be flatter. however, i have seen 1/2" used on ceilings successfully if the joists are 16" on center or lesser.

[Joseph Meehan]

Increased fire blocking. less sagging and heavier trying to put up.

[malamilia]

Thanks. My Joists are spaced 16 in OC and I am planning on applying the wallboard directly on the joists. From what i've seen in the rest of the house , the Joists may not be level. If the 5/8 will help to correct some of the problem, I'll go for it then. Is there any advantage in stargering the joints? or just apply parpendicular to the joists symmetrically ?

Thanks.

[Edwin Pawlowski]

Most building codes require 5/8" for flame resistance.

[RicodJour]

There are 1/2" boards specifically made for ceilings, such as SHEETROCK=AE Brand 1/2" Interior Gypsum Ceiling Panels

Lighter weight so it's easier to install and it's stiffer than regular

1/2" rock. Good way to go. R

[Joseph Meehan]

I would suggest that if you really have joist that are not level, 5/8 will not fix that, you need to shim the joist to get it properly flat.

[malamilia]

Do you mean to install shims between the joist and drywall as needed ?

[Joseph Meehan]

Sort of.

[mrsgator88]

I had can lights put in my kitchen this week (late '50's split level). The ceiling was plaster OVER drywall. It was 7/8" thick. They also used chicken wire in the corners. Just thought I'd share...

S

[dr_swami]

You can also use 1/2" high density board. Hand trowling will help hide any defects as well and looks more professional in my opinion.