Ideas on creating buffer between drywall and HVAC

3 years ago

Recently moved into a new construction home. A few months ago, we started noticing a loud banging/popping noise in our walls during and after the heat would run. We brought this up to our builder. They said the noises in the wall were normal and left it at that. So, on a weekend when it was really loud, we tore out the drywall where the popping/banging/knocking was loudest and noticed the runs are sitting right up against the drywall. There is no room for them to expand and contract. Since removing that section of the drywall, the noises have mostly gone away. Before we put up the drywall back, we want to make sure there is a buffer between the drywall and runs. Any ideas on what we could do?

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Comments (5)

sktn77a
3 years ago
If it's just at those two locations, pack the space beside and around the duct with insulation.

If your builder thinks bothersome noises are "normal"................. I don't think much of your builder!
HU-867564120
3 years ago
Maybe use something like this?

https://www.menards.com/main/building-materials/insulation/radiant-barrier/reflectix-reg-r-3-7-reflective-bubble-insulation-16-x-25/st16025/p-1444452049026-c-5778.htm?tid=4936958017583778428&ipos=42&exp=true
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ci_lantro
3 years ago
Thin yoga mat or some of that foam type laminate flooring underlayment. But I kinda' doubt that it will solve the problem.
mojavemaria
3 years ago
How big is the wall? If its not to big you could put put furring on exposed studs and go over whole wall with new sheet rock. It would have to be taped, textured and painted but would give you an air gap to your ducting.

We put green glue and an added layer of drywall on a laundry wall and it did wonders for sound dampening.
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Charles Ross Homes
3 years ago
I think your best best is to cut the drywall at the two stud bays and remove it. Remove and replace the ducts with ducts that fit properly in a 3 1/2" stud bay. Then replace the drywall, patch and paint.