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Old 08-04-2011, 03:59 PM   #1
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Roof Ductwork Insulation


I am buying a house that has a built up roof and the AC unit is on top of the roof. All the duct work is on the roof as well. None of the ducts are insulated and you could just about fry an egg on them in the summer. I'm pretty sure this isn't very efficient.

I am wondering what options I have for insulating them myself. I've googled it a lot and come up with answers for indoor ducts rather than outdoor.

A roofer quoted me 3000 dollars to spray foam insulation on it.

The house is only 1300 square feet...this leaves about 6 ducts off the AC unit on the roof.

One site said to use Duct Insulation - R-6.0 around it but I'm not sure that's good for exterior insulation. Any suggestions would be helpful. I don't mind doing the work myself.

Here is a picture of the roof, if it helps.



Thanks a bunch.

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Old 08-08-2011, 11:20 AM   #2
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Roof Ductwork Insulation


Hey there, I guess I had originally posted into the wrong section of the forum and it probably fell to far down on the list for some to read so I'm replying.

Any help with this would be appreciated. I live in Phoenix and will be moving into this house within the next 2 weeks. thanks!

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Old 08-08-2011, 11:36 AM   #3
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Roof Ductwork Insulation


Welcome Beeceee, to the best darn DIY'r site on the web.

In a brief search I have come up with this

http://www.tvmi.com/prod_detail.php?...=&a=&am=&p=217

There are many more options I am sure.

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Old 08-08-2011, 11:51 AM   #4
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Roof Ductwork Insulation


Thanks! How I did not find this is beyond me. I was searching all day. :|

Thanks so much, I will check this out
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Old 08-08-2011, 02:26 PM   #5
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Roof Ductwork Insulation


Quote:
Originally Posted by beeceee View Post
I am buying a house that has a built up roof and the AC unit is on top of the roof. All the duct work is on the roof as well. None of the ducts are insulated and you could just about fry an egg on them in the summer. I'm pretty sure this isn't very efficient.

I am wondering what options I have for insulating them myself. I've googled it a lot and come up with answers for indoor ducts rather than outdoor.

A roofer quoted me 3000 dollars to spray foam insulation on it.

The house is only 1300 square feet...this leaves about 6 ducts off the AC unit on the roof.

One site said to use Duct Insulation - R-6.0 around it but I'm not sure that's good for exterior insulation. Any suggestions would be helpful. I don't mind doing the work myself.

Here is a picture of the roof, if it helps.



Thanks a bunch.
I think one of the best products for hard to reach and insulate areas is a spray foam insulation product. Not only is it very efficient and cost-effective, but it is a "green" product as well. It also has a high "R" value too. We did our house a few months ago and even the A/C is on less often. I even find that it works well as a soundproofing material :-)

We used a product called foam-it Green (http://www.sprayfoamdirect.com/). I hope you find that useful. :-)
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Old 08-08-2011, 05:16 PM   #6
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Roof Ductwork Insulation


Are you sure that duct work does not have an insulated liner?

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