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Old 01-23-2012, 01:12 PM   #16
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How to seal off opening in 3 layers of 1/2" drywall


I don't think there is enough room for something like this: http://i21.geccdn.net/site/images/n-...C_57231281.jpg

Are there pre-made pieces of rectangular sheet metal (the size of the register) with a flange area on the inside to fasten to the duct?

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Old 01-23-2012, 01:16 PM   #17
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How to seal off opening in 3 layers of 1/2" drywall


Since there is no picture of the duct we will just make a guess.
The adaper gets sliding into the whole and the pipe or hose just slip right on. Is it metal pipe or flex duct?
Flex would use a radiator type clamp or a wire tie and duct tape over the joint, (foil duct tape, not cloth type)
A metal one would use short duct screws with a hex head on them.
Once in place you go inside and attach the defuser to cover up the hole where the air come out with the two screws that come with it.
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Old 01-23-2012, 01:39 PM   #18
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How to seal off opening in 3 layers of 1/2" drywall


It's a large rectangular duct with a rough-cut hole in the side. Nothing is going to just clamp or fit on. Something will have to be fastened on.
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Old 01-23-2012, 02:36 PM   #19
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How to seal off opening in 3 layers of 1/2" drywall


Measure the rough opening size and the distance from the ceiling to the duct. Get a sheet metal shop to make a boot to fill the space in a size closest to a standard diffuser. Then attach it to the duct. The problem with not having the sheet metal is that your conditioned air is leaking into the ceiling cavity where it is not only costing you money, but stirring up dust. Also a diffuser will allow you to regulate the airflow into the room.
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Old 01-23-2012, 03:29 PM   #20
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How to seal off opening in 3 layers of 1/2" drywall


Unless all you are asking is how to seal the edges of a register install...... Shame on us for not telling him the easy and obvious way to do this.

Assuming everything is solid and sound up there.......

Simply cut the ceiling side piece of drywall 2" bigger, all the way around......

Then cut the center (sandwiched) piece 1" bigger all the way around......

Now, fasten in wide pieces of backer wood to the top sides of the upper piece of drywall, leaving it hanging over the edges of the opening of the hole about an inch.

Ready to install three rectangles of drywall. Use type "X" or type "C" drywall.

One to match each of the holes in each layer. Screw and glue each layer, and seal the edges with d/w mud as you build downward.

If you need a picture, let me know, and I'll draw a quick one..... but I think you can understand this.

Normal heating or cooling won't affect the bare drywall, but if you're nervous about temps getting too high, screw in a sheet of metal above everything before you begin installing the layers of drywall.
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Old 01-23-2012, 03:38 PM   #21
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How to seal off opening in 3 layers of 1/2" drywall


Drywall as a supply chase is prohibited by code, if the air temp can exceed 120°F.
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Old 01-23-2012, 03:47 PM   #22
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How to seal off opening in 3 layers of 1/2" drywall


Quote:
Originally Posted by Willie T View Post
Unless all you are asking is how to seal the edges of a register install...... Shame on us for not telling him the easy and obvious way to do this.

Assuming everything is solid and sound up there.......

Simply cut the ceiling side piece of drywall 2" bigger, all the way around......

Then cut the center (sandwiched) piece 1" bigger all the way around......

Now, fasten in wide pieces of backer wood to the top sides of the upper piece of drywall, leaving it hanging over the edges of the opening of the hole about an inch.

Ready to install three rectangles of drywall. Use type "X" or type "C" drywall.

One to match each of the holes in each layer. Screw and glue each layer, and seal the edges with d/w mud as you build downward.

If you need a picture, let me know, and I'll draw a quick one..... but I think you can understand this.

Normal heating or cooling won't affect the bare drywall, but if you're nervous about temps getting too high, screw in a sheet of metal above everything before you begin installing the layers of drywall.
I sort of understand what you're describing, but it sounds like you're closing off the hole entirely when you say "Ready to install three rectangles of drywall . . . One to match each of the holes in each layer."
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Old 01-23-2012, 03:49 PM   #23
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How to seal off opening in 3 layers of 1/2" drywall


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I sort of understand what you're describing, but it sounds like you're closing off the hole entirely when you say "Ready to install three rectangles of drywall . . . One to match each of the holes in each layer."
That's why I wrote the first sentence. Your post sounded like you wanted to seal up the hole.

This is the title to your post : How to seal off opening in 3 layers of 1/2" drywall
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Old 01-23-2012, 04:25 PM   #24
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How to seal off opening in 3 layers of 1/2" drywall


I guess my post could be interpreted that way. I said "How can I seal off that drywall" meaning seal off the sides of the drywall just to reduce potential for dust or chunks to fall down or whatever. "Seal off that drywall could also mean seal off the "hole in the drywall". :-) Sorry for the confusion.
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Old 01-23-2012, 04:28 PM   #25
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How to seal off opening in 3 layers of 1/2" drywall


Is that a oval hole just cut into the bottom of you main trunk?

Buy a flat strip of Ductwork metal. Bend it into a rectangle that fits inside your hole and sized for a register. Bend tabs inwards on it to screw into the existing hole. (bend tabs first then make into rectangle).
DO a google search on sheet metal bending.

You basically need a rectangle extension extension to get down to the surface of the drywall.

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Old 01-23-2012, 04:43 PM   #26
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How to seal off opening in 3 layers of 1/2" drywall


Yeah that looks like exactly what I need (well I'm still not sure about the "need" part. FWIW, it has been in it's current state for the past 8 years since the previous owners did these renovations). I don't have a sheet metal bender though. I've used one a long time ago so I know what they are. The one I used was a huge one.
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Old 01-23-2012, 05:21 PM   #27
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How to seal off opening in 3 layers of 1/2" drywall


"I'd reckon to say that Horsehair plaster & wood lathing weighs more per SF than 3 layers of conventional 1/2" GWB per SF.
"------ you reckon right.

5th down the list: http://www2.iccsafe.org/states/Flori...20Material.pdf

djgrnt, any sheet-metal shops or trade vocational schools in the area?

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Old 01-23-2012, 11:26 PM   #28
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How to seal off opening in 3 layers of 1/2" drywall


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Originally Posted by djgrant View Post
Yeah that looks like exactly what I need (well I'm still not sure about the "need" part. FWIW, it has been in it's current state for the past 8 years since the previous owners did these renovations). I don't have a sheet metal bender though. I've used one a long time ago so I know what they are. The one I used was a huge one.
Can bend it with a couple of pieces of angle iron or even 2x4 or 1x4
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Old 01-24-2012, 03:20 PM   #29
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How to seal off opening in 3 layers of 1/2" drywall


I found a metal shop and I will send them a spec for something that looks like what mae-ling drew.
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Old 01-25-2012, 03:28 PM   #30
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How to seal off opening in 3 layers of 1/2" drywall


Just a few things:

-I found a sheet metal shop, I'm going to send them a spec and see how much it costs
-What is a diffuser? Is that the same as a register? Or is it something else?
-@mae-ling: can you send me that drawing or file? I may just use that and put dimensions on it. I'm also just curious what program you used to draw that.
-Any advice on drilling holes in the duct? I've screwed holes in a hollow metal door just recently and just used a drill at lowest speed and took my time (so the drill bit wouldn't heat up)
-Should I just screw it to the duct? Or should is there something else I can do to seal the joint?

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