[mmhendrie]

quick question - about to put my ceiling up, normal drywall, going on 24inch joists, for a bathroom - do I screw & glue, or just screw?

 

[Phuture]

you couls just screw it. with 24" oc joists you may want to consider 5/8" drywall. anything less may tend to sag in between the joists under humid conditions.

 

[mmhendrie]

live in Los Angeles - what's humidity!? :wink:

 

[Phuture]

i hear ya!:yes:

 

[Phuture]

what part of L.A.? my uncle owns a pizza joint in san pedro.

 

[mmhendrie]

further north of San Pedro - Culver City

 

[AtlanticWBConst.]

24" O.C.? I's say to add strapping at 16" OC. Then install 5/8" GWB. Glue and screw.

If it's a large ceiling, and your trusses are moving, that is a whole different installation.

 

[Ininkus]

24" O.C.? I's say to add strapping at 16" OC. Then install 5/8" GWB. Glue and screw.

If it's a large ceiling, and your trusses are moving, that is a whole different installation.

Can you expand on this? I am drywalling a 24'x24' cathedral cieling (trusses, not rafters), they are 24" on center and I am using 5/8" drywall, 12 foot long peices.

Should I use screws and glue both? TIA

 

[bjbatlanta]

If you go with the strapping on 16" centers you can use 1/2" rock. You need 5/8" for 24" centers. Always use adhesive. Less fasteners necessary, thus fewer "pops".

 

[mmhendrie]

what do you mean by pops?

 

[bjbatlanta]

Maybe I should have phrased it less chance for ANY "pops" which happen when lumber "moves". Lumber expands/contracts during heating/cooling seasons. New lumber dries out and shrinks to some extent. This can cause fasteners to "protrude" back out of the stud slightly as they don't move with the lumber. Thus you get a nail/screw "pop". A common occurrence. You may not get any going into seasoned lumber. And humidity is still a factor in L.A. if you take a hot enough shower.....

 

[rtoni]

New lumber dries out and shrinks to some extent. This can cause fasteners to "protrude" back out of the stud slightly as they don't move with the lumber. Thus you get a nail/screw "pop". A common occurrence. You may not get any going into seasoned lumber

hmmm- maybe I can leverage that point - to feel a bit better about being a slow poke and taking forever on my project - the framing's been up for about a year and a half now - does that mean it's seasoned and possibly fewer pops when the drywall goes up?

feel free to throw me a bone here :yes:

 

[bjbatlanta]

You're pretty safe as far as "shrinkage" goes I think. Lumber still "moves" during "seasonal" changes in heating and cooling (and at times for other unforseen reasons such as settling). I still recommend using adhesive. If you have a wall in your house that you know is not glued, bang on it with the heel of your fist. You can hear the board "rattle" against the studs (interior non-insulated wall). The same wall with glue won't do that. If you ever have to patch a wall that has been glued, when you tear out the piece to be patched, the backing paper on the rock will still be on the stud when you pull the damaged piece out. The likelyhood of "seasonal" lumber movement causing fasteners to "pop" is greatly diminished with adhesive....