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Mijotter 12-15-2012 01:45 AM

Insulation inside air returns
I'm replacing my old sheet metal returns in the ceiling with Thermopan duct board. My question is, can I place xps rigid foam board in the rim joists inside the return before putting the new duct boards up? I would seal them with Great Stuff or is that not advisable.

md2lgyk 12-15-2012 07:29 AM

Why would you want to insulate a return duct?? I don't see why you couldn't put in some XPS but don't see the point of doing so.

joecaption 12-15-2012 08:27 AM

Only supplys need to be insulated.

Mijotter 12-15-2012 01:29 PM

1 Attachment(s)
not insulate the duct themselves. just the rim joist that the plenum buts up to. This is a basement ceiling btw. I have all the other open rim joists properly insulated and was just wondering if I should do the same that the plenums butt up against in the ceiling as they follow the ceiling joist.

Mijotter 12-15-2012 03:22 PM

Anyone? Would like to get this started today.

HVACTECH96 12-15-2012 04:35 PM

Looks like panning on bottom of joist.If this panning is going all the way to the outside bond, then chances are there are openings at the exterior walls for R/A going to upper floors.So trying to put insulation in the joist space around the bond probably wont be possible without covering cutouts.

Mijotter 12-15-2012 04:38 PM

Correct but there is about 3 inches of space between the cutout and the outside wall where 2"xps could feasibly go. I just need to know if it will helop with insulation at all and that kind of insulation will be ok in a return(health reasons

md2lgyk 12-15-2012 05:01 PM

I wouldn't do it. No reasonable return (pardon the pun) to justify the expense and effort.

HVACTECH96 12-15-2012 05:01 PM

You planning on replacing metal panning with duct board or using pieces of duct board to insulate .

Mijotter 12-15-2012 05:02 PM

replacing the sheet metal with Thermopan ductboard.

HVACTECH96 12-15-2012 05:06 PM

If it were me I would use pieces to insulate the bond and leave the metal up.Or buy couple cans of great stuff and foam the space for a better air seal.

Mijotter 12-15-2012 05:17 PM

Why is that? The reason i'm doing this is because it's old, filthy, and I'm sound proofing the basement. Will xps in that area hurt or not?

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