Just wondering about adding Insulation to a flat roof home?

rodm1

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.

ionized

What is your climate like?

jklingel

is the foam on the outside or inside of the roof sheathing?

Windows on Wash

Need more details.

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rodm1

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

Windows on Wash

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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rodm1

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

Windows on Wash

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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rodm1

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.

Gary in WA

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

Gary

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