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Question on second layer of drywall layout for ceiling installation.

Question on second layer of drywall layout for ceiling installation.

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  #1  
Old 03-14-14, 01:50 PM
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Question on second layer of drywall layout for ceiling installation.

I am installing 2 layers of 5/8 drywall in my basement ceiling for soundproofing. First layer is going in perpendicular to joints becuase it is stronger, less sag(most people recommended). What about second layer? Should it go parallel or perpendicular to the joints? I did some drawing, are these good? I hope these drawing are clear enough.

First pic is the room with width/length and first layer of drywall going perpendicular.
Second pic is second layer of drywall going parallel.
Third pic is second layer of drywall going perpendicular.
All using 5/8, 4'x8' drywall.

What do you think? thanks for your help.

PS: I am also adding green glue between the 2 layers and other soundproof materials else where.

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  #2  
Old 03-14-14, 02:32 PM
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Welcome to the forums! Door #3. This will give you overlap throughout the entire ceiling. The drywall needs to run in the same direction across the joists.
 
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Old 03-14-14, 05:04 PM
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Yes, joists, not joints.

I'm in agreement with Larry. The 2nd layer of drywall should also be installer perpendicular to the joists. But when you install the 2nd layer, offset the edges of your sheets so that the joints do not fall in exactly the same place. (just like you have drawn in the bottom right picture.)
 
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Old 03-17-14, 04:31 PM
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Chandler and XSleeper, thanks!

So, both layers(1 and 2) have to be perpendicular, got it!
When you said offsetting the joints is this what you are talking about? In the picture below, I circled them in blue color. 1,2 and 3 is bad? If I offset them I will have more butt joints.

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Old 03-17-14, 04:52 PM
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It's unfortunate that they line up but no, that's not a big deal... and I would certainly not create more joints than you have to. The way you are doing it will offset most of the joints which is good... mainly you want your tapered edge joints to be offset for sure.

(this brings up the question of why 12' sheetrock wasn't used... I suppose it either didn't fit down the stairs into the basement or you didn't have the manpower to lift it) It would have eliminated 10ft worth of butt joints (all of them) which is the harder of the 2 types of joints to float & finish.
 
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Old 03-18-14, 02:40 PM
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XSleeper, thanks for the quick reply.

12' sheetrock, I never thought of it! @[email protected] Thanks!!!! I haven't ordered anything or done any work yet. I am only planning now, work will begin next month.
Few more questions.

1) Factory Tapered edge has to go against Factory Tapered edge of another sheet? For example, if I cut a 4'x12' to 2'x12' that cut edge shouldn't line up with a factory tapered edge?

2)Same with Butt edge? If I cut a 4'x12' to 4'x10' this cut edge shouldn't line up against anther butt edge?

3) Cut edge <--> cut edge?

4) is 2 person enough man power to handle 12' sheetrock?

Thanks for you help.
 
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Old 03-18-14, 04:44 PM
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1). correct

2). butt joints are any joints that are not taper to taper.

3). yes

4). maybe. 5/8" is pretty heavy. You can also rent a drywall lift which will make life easier. A lift takes all the work out of ceilings and are pretty much worth any price they would charge for rental.
 
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Old 03-19-14, 03:21 AM
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I would just add that you can usually place the cut edge up against the ceiling/wall so the beveled edges are always together. You can finish a cut edge next to a beveled edge but it's more work, easiest way is to prefill the bevel and then treat it like a butt joint.
 
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Old 03-20-14, 01:16 PM
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Thanks XSleeper, and thank marksr for the tip!

My latest drawing, about 400 sqf. Red is the first layer and black is the second layer(outer layer), using 4'x9' boards. There are quite a few butt joints.

*its 4'x8', sorry.

1)Any tips for smoothing out the butts?
2)Should I switch it around? Make black the first layer and Red the second layer?
3)I don't see any way to have less butts but If you do please advice.

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thanks
 

Last edited by NYJohn; 03-20-14 at 02:41 PM.
  #10  
Old 03-20-14, 01:50 PM
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4'x9' sheets, is that a mis print? Locally we can only get 8" and 12' lengths. The more 12' boards you can use the less butt joints you'll have but other than that there is no getting away from them. Basically butt joints just need a wider finish to make them appear to disappear It's not uncommon for a butt joint finish to be almost 2' wide.
 
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Old 03-21-14, 11:35 AM
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I thought every store has 4' x 8' , 9', 10', 11' and 12".
 
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Old 03-21-14, 11:51 AM
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I've heard of 10' drywall but never seen any. All I've ever seen is 1/4",3/8",1/2" and 5/8" in 8' or 12' lengths. Most boards are 48" wide but you can also get 54" wide drywall. Check your local drywall supply house to see what's available, they'll have a better selection than the big box stores.
 
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Old 03-21-14, 04:24 PM
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In 5/8" drywall you will probably only find 8's and 12's if you are shopping at the box store.
 
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