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-   -   3/8 vs. 1/2 (http://www.diychatroom.com/f101/3-8-vs-1-2-a-105051/)

amakarevic 05-20-2011 03:41 PM

3/8 vs. 1/2
 
basic question: is 3/8 used for ceilings while 1/2 is used primarily for walls?

thanks

Willie T 05-20-2011 04:16 PM

No, 5/8 for ceilings.

sixeightten 05-20-2011 04:18 PM

3/8 can be used for curved walls or on repair work. It can also be applied directly over plaster.

amakarevic 05-20-2011 04:25 PM

Quote:

Originally Posted by Willie T (Post 651637)
No, 5/8 for ceilings.

why is thicker/heavier used for ceilings? i would expect it would be better if it is lighter.

mustangmike3789 05-20-2011 04:33 PM

Quote:

Originally Posted by amakarevic (Post 651642)
why is thicker/heavier used for ceilings? i would expect it would be better if it is lighter.

5/8 is thicker/heavier/more ridged. 3/8 will sag between every rafter.

amakarevic 05-20-2011 04:34 PM

thanks. makes perfect sense now.

dberladyn 05-21-2011 03:40 PM

3/8's should only be used for strange repairs and curved walls. Everything else should be 1/2" or 5/8"s.

PS.

1/2" is perfectly fine for ceilings, if your joists/trusses are 24" on center you need to use 1/2" CD board.

5/8" is good for everything but then there are drawbacks, such as cost, more work to install, acoustically it will change the way a room sounds and if used on both sides of a wall it may cause difficulties with trimming your doors.

bjbatlanta 05-22-2011 10:15 AM

1/2" is acceptable on ceilings if framing is 16" o.c., 5/8" for 24" o.c. framing.....

Anti-wingnut 05-22-2011 10:30 AM

Quote:

Originally Posted by bjbatlanta (Post 652524)
1/2" is acceptable on ceilings if framing is 16" o.c., 5/8" for 24" o.c. framing.....

Unless there is a requirement for a fire rating or some other assembly. SFR's using TJI's will often be required to use 5/8" type X drwall because engineered lumber burns much more rapidly than nominal sawn lumber. Some areas have recognized the use of fire rated 1/2" GWB, but this is not universal

I'm sure that BJ knows this

dberladyn 05-22-2011 10:57 AM

Quote:

Originally Posted by bjbatlanta (Post 652524)
1/2" is acceptable on ceilings if framing is 16" o.c., 5/8" for 24" o.c. framing.....

Do you not have "CD" board in your area? 1/2" CD board is designed for 24" spans.

As for fire ratings, that's a seperate issue and code specific to different areas.

Dan

nateshirk 05-24-2011 09:38 PM

Just for reference, I used 3/8 on my garage walls, and it seems strong enough. I know...lots of people don't recommend it, but it worked, it's lighter, and cheaper, and it was just my garage.

sixeightten 05-24-2011 09:41 PM

Quote:

Originally Posted by nateshirk (Post 654364)
Just for reference, I used 3/8 on my garage walls, and it seems strong enough. I know...lots of people don't recommend it, but it worked, it's lighter, and cheaper, and it was just my garage.


Cheaper? I think not. At least not in cost. It is a cheaper (inferior) product though.

Anti-wingnut 05-24-2011 09:43 PM

Funny thing is, as per modern fire ratings, you should have used 5/8 Type X or 1/2 fire rated board in your garage.

nateshirk 05-25-2011 10:42 PM

I'm sure that's what they used for the exterior walls of the house. I just finished the rest of the garage.

Anti-wingnut 05-25-2011 10:44 PM

The garage is the most flammable spot in the house


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