Framing Around Ductwork


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Old 02-26-23, 12:02 PM
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Framing Around Ductwork

Older home with no space between floors so AC folks had to get creative with running ductwork.
So I have to frame it in for drywall but am concerned about sagging, especially with the longer ribs. I was thinking that maybe I should attach a verticle 2x4 from each rib up to the joist above it as close to the center of the rib as possible. One of the longer ribs runs down the center of the duct so will not be able to do that. Any suggestions much appreciated.



 
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Old 02-26-23, 05:36 PM
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Well a pro would probably frame it differently. You have no fireblocking and nothing to keep things aligned in a straight line.

Bottom pic: Best way I have found to do it would be like framing a short wall that hangs down from the ceiling... a top plate nailed flat to the bottom of your floor joists, studs 16" on center, and a bottom plate that would be about 2" below your ductwork.

Then on your back wall you need a ledger flat against the concrete blocks. It looks like yours is laying on TOP of your wall furring. (Those gaps behind the ledger need fireblocking) Then I would use a 1 5/8" steel stud track, fastened to that ledger in back, and to the back of that short wall hanging down from the ceiling in front. Then lay your flat 2x4s horizontally in that steel stud track. In the link above the measurements are correct but the HD photo is not accurate. It's actually about the size of a 2x2, and your 2x4s will slip right into it when laid flat.

And then in the front portion of your top pic I would frame that the same way I mentioned above, but you would kick down with a shorter wall in the middle where ever possible, so that the middle of the ceiling span could be supported.
 
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Old 02-27-23, 08:46 AM
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Thanks. That would have been easier. Fortunately I used screws so it'll be easy to take apart and do over.
 
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Old 02-27-23, 02:49 PM
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One question ....... I assume the strud track is being attached to the back of the hanging short wall so that the bottom of the plate is flush with the bottom of the track or stud that goes in it. How would you attach the stud track to the side of the plate? They're open ended.
 
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Old 02-27-23, 03:43 PM
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The stud track is U shaped. When building a vertical wall you usually fasten the bottom of the stud track to the floor and ceiling. In your case you are turning it on its side... so what is normally the bottom will be on its side and screwed to the wall ledger on one side and to the back side of the bottom plate on the other. And yes, it will be flush with the bottom of your bottom plate. (That is why your short wall is 2" longer than the duct... so that you have about 1/2" of room between those flat 2x4s and your ductwork. Nothing should touch or be fastened to the ductwork.

Then when you slip your flat 2x4s into it (cut them about 3/8" short), you will put pairs of truss head screws (example) through the side of the metal track... screwing straight up into each end of the 2x4s. Use those same screws to fasten the stud track to the ledger and back of your short wall that hangs from the ceiling, every 16 or so.
 
 

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