Cover ( "bury") Insulated Ductwork With Blown In Fiberglass ? - Insulation - DIY Chatroom Home Improvement Forum
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Old 07-03-2016, 06:03 AM   #1
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Cover ( "bury") insulated ductwork with blown in fiberglass ?


My 1970s house has the 2nd floor HVAC system in the attic. The metal ducts are wrapped with foiled backed fiberglass insulation (old and compressed) which is probably not doing much. Unfortunately, access to many of ducts virtually impossible to re-seal and re-insulate ( would require drwall demo and big mess in the house) or even repalce with R-8 flex. However, the ductwork is accessible enough to cover with thick layer of blown-in fiberglass insulation. This would be quick and inexpensive solution (yes a compromise) if it worked. Will it help signifantly and are there any other issues to consider ? -Thanks
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Old 07-03-2016, 11:40 AM   #2
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Re: Cover ( "bury") insulated ductwork with blown in fiberglass ?


You can cover it. You would be well served to seal everything you see as a gap in the foil facing. If you have enough space, wrapping it in insulation and combination of air barrier is not a terrible idea either.
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Old 07-03-2016, 03:14 PM   #3
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Re: Cover ( "bury") insulated ductwork with blown in fiberglass ?


As an alternative to blown fiberglass, check for blown cellulose. It is much denser and adds some resistance to air leakage, ducts as well as the entire ceiling. In addition to sealing the ducts you can, look for the big leaks, around chimneys plumbing vents, or drop ceilings. And don't forget the attic access, air sealed and insulated.

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Old 07-03-2016, 04:04 PM   #4
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Re: Cover ( "bury") insulated ductwork with blown in fiberglass ?


There is currently about 10 inches of blown in fiberglass of the original batts.

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Originally Posted by Bud9051 View Post
As an alternative to blown fiberglass, check for blown cellulose. It is much denser and adds some resistance to air leakage, ducts as well as the entire ceiling. In addition to sealing the ducts you can, look for the big leaks, around chimneys plumbing vents, or drop ceilings. And don't forget the attic access, air sealed and insulated.

Best,
Bud
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Old 07-03-2016, 04:34 PM   #5
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Re: Cover ( "bury") insulated ductwork with blown in fiberglass ?


Sounds like you are close to the minimum recommended level but adding more is not bad and if you are going to cover the ducts, then a few more inches across the entire attic floor isn't that difficult.

Do you plan on blowing it in yourself?
Do you have access to cellulose?

Check the 09 minimum levels for where you live here: https://energycode.pnl.gov/EnergyCodeReqs/ Remember, these are minimum levels. Also, these are for 09. 2012 and 2015 code levels have been adopted in some locations so check your code office.

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