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Old 12-07-2011, 09:56 AM   #1
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Insulating under HVAC trunk


I'm air sealing and adding insulation to our attic.

We have a sheet metal trunk with flex duct in our attic as well.

Right now, those are resting on the 2x6 joists.

I'm already adding 2x10s to make access easier to areas of the attic.

Should I raise the sheet metal trunk with 2x10s and insulate underneath?

Similarly for the flex runs, should I raise those as well or let them rest on the joists?

(Picture attached)

Thanks.
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Old 12-07-2011, 08:13 PM   #2
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Insulating under HVAC trunk


No.

Seal all the seam and connection in the ductwork. Seal the boots to the ceiling.

What are you adding 2x10's for?

Blow the insulation right over the top of the ductwork and move it into the insulation layer.

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Old 12-07-2011, 09:49 PM   #3
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Insulating under HVAC trunk


I agree. Is that a skylight chase 1/2 insulated? Or just the gable-end? Add foam board or housewrap after the wall cavity insulation to prevent major degrading by wind-washing there.

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Old 12-08-2011, 07:42 PM   #4
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Insulating under HVAC trunk


Thanks.

I'm adding the 2x10s so that I have catwalks to get to things if I need to in the future.

That's one of the catwalks in the picture that I've already built.

There used to be floorboards on top of the joists but I've removed them.

We don't need the attic space for storage and I'm not sure it is rated for the weight.

That's a gable-end in the picture. The part with the falling down insulation is conditioned space. If I'd panned to the right just a bit more you would have seen the section I've already enclosed with XPS. =)
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Old 12-09-2011, 12:33 PM   #5
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Insulating under HVAC trunk


BTW, I found this as a great reference that talks about the pros and cons of both approaches:

http://www.etccreations.com/hvac/atticducts

I'll be burying the ducts in the insulation for my solution.
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