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Old 07-17-2012, 03:21 PM   #1
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Just wondering about adding Insulation to a flat roof home?


My home is a flat roof and I believe it's 2x8 construction. I have an air gap of about 6 inches. The roofing is EPDM with some foam under it. The eave vent is about a 1 inch gap along the length of the roof.

My question is could I add any more insulation up there and not hurt the venting? It's been something I've wondered about but it way low on my list.

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Old 07-17-2012, 06:10 PM   #2
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Just wondering about adding Insulation to a flat roof home?


What is your climate like?

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Old 07-17-2012, 11:53 PM   #3
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Just wondering about adding Insulation to a flat roof home?


is the foam on the outside or inside of the roof sheathing?
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Old 07-18-2012, 09:55 AM   #4
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Just wondering about adding Insulation to a flat roof home?


Need more details.
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Old 07-18-2012, 04:58 PM   #5
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Just wondering about adding Insulation to a flat roof home?


I'm in Michigan temps run from 20 to about 90 some times lower and higher but that is generally what you can expect.

The foam is over top of the old tar roof (Sheathing, Tar, Foam, last EPDM).


Anything else you need to now?


Thanks,

Rod
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Old 07-18-2012, 06:11 PM   #6
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Just wondering about adding Insulation to a flat roof home?


So the venting is under the old sheathing at the original level then?

If that's the case, you are limited by insulation depth because you don't want to block off that venting. You can blow in more insulation in that interstitial space but don't block the vents.
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Old 07-19-2012, 04:36 AM   #7
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Just wondering about adding Insulation to a flat roof home?


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Originally Posted by Windows on Wash View Post
So the venting is under the old sheathing at the original level then?

If that's the case, you are limited by insulation depth because you don't want to block off that venting. You can blow in more insulation in that interstitial space but don't block the vents.


Correct, How close could I get to the sheathing? I believe I have about 7 inches of air space.

Last edited by rodm1; 07-19-2012 at 04:38 AM.
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Old 07-19-2012, 07:04 AM   #8
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Just wondering about adding Insulation to a flat roof home?


Within an inch and the CC SPF has to be done in lifts.

I think we need some pictures of the attic because (no offense) the message is a bit jumbled.
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Old 07-19-2012, 04:31 PM   #9
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Just wondering about adding Insulation to a flat roof home?


I'm afraid photo's won't be helpful there isn't anything to really see (no way to see the construction). If I add insulation it probable would be blown in insulation.
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Old 07-21-2012, 12:50 AM   #10
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Just wondering about adding Insulation to a flat roof home?


http://www.buildingscience.com/docum...+in+flat+attic

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