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Old 03-06-2018, 09:40 AM   #1
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Enclosing furnace ducts


I posted this is the drywall section but now I think it's better suited for the remodel section.

Trying to enclose furnace ducting with drywall. When it was just a supply duct, I would have just screwed a 1/2" piece of drywall to the bottom of the 2x2 walls. With the circular return next to it, the span is now 26".

Would a 26" wide piece of 5/8" drywall sag?

If I have to , we can move the circular duct 2" away from the supply to allow installation of a middle support wall. Would prefer not to do that, to avoid extra work and keeping box as small as possible.
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Last edited by jkk; 03-06-2018 at 09:55 AM.
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Old 03-06-2018, 09:54 AM   #2
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Re: Enclosing furnace ducts


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Originally Posted by jkk View Post
Would a 26: wide piece of 5/8" drywall sag?
Yes it would.

Quote:
to avoid extra work...
This is the reason behind a LOT of work getting redone.

Whatever else you do get a bucket of mastic and a chip brush.
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Old 03-06-2018, 09:55 AM   #3
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Re: Enclosing furnace ducts


We would have dropped a few more inches and run 2x4 on the flat between the drops walls. If you have the height I would just strap it below the 2x2 with 2x4 2 ft OC. That will also help prevent warping.
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Old 03-06-2018, 09:57 AM   #4
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Re: Enclosing furnace ducts


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Whatever else you do get a bucket of mastic and a chip brush.
? Why mastic and chip brush?
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Old 03-06-2018, 09:59 AM   #5
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Re: Enclosing furnace ducts


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We would have dropped a few more inches and run 2x4 on the flat between the drops walls. If you have the height I would just strap it below the 2x2 with 2x4 2 ft OC. That will also help prevent warping.
Trying to save the height. I'm 6'4" and hate ducking in the basement. I'll probably move the round duct over, insert another 2x2 wall between the 2 ducts.
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Old 03-06-2018, 10:11 AM   #6
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Re: Enclosing furnace ducts


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Trying to save the height. I'm 6'4" and hate ducking in the basement. I'll probably move the round duct over, insert another 2x2 wall between the 2 ducts.
Add a 2x2 or 2x3 to the inside of the left side.
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Old 03-06-2018, 10:26 AM   #7
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Re: Enclosing furnace ducts


Do you have the clearance to install a metal stiff leg between the two ducts than use a main beam as in the Dry wall metal grid system attached to the stiff legs. The stiff would be required every 4 ft.
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Old 03-06-2018, 11:56 AM   #8
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Re: Enclosing furnace ducts


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? Why mastic and chip brush?
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Old 03-06-2018, 01:15 PM   #9
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Re: Enclosing furnace ducts


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Do you have the clearance to install a metal stiff leg between the two ducts than use a main beam as in the Dry wall metal grid system attached to the stiff legs. The stiff would be required every 4 ft.
Never used a metal grid system. Where can I learn about that?
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Old 03-06-2018, 02:34 PM   #10
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Re: Enclosing furnace ducts


See if you can find a USG hand booklet.
Research dry wall metal grid system it is very much like an Acoustical but design for the attachment of dry wall. try this www.usg.com.
The reason i stated the use of stiff leg was because if you use hanger wire you will have a problem of the beam moving up when the screw contacts it.
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