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I have an extension on my house and its got a flat roof. I pulled down the drywall ceiling to do some electrical upgrades and to reinsulate. My plan was to just put some r38 batts up and call it a day. The cavity space is 11 1/4" at the low point and 13 1/2" at the high point. Would the batt insulation be ok? Or should i put in baffles to create an air space?
 

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You need to create a ventilated air gap between the insulation and the roof plywood. The insulation can not directly touch the plywood. This page has some good pictures that explain it well:

http://diy.blogoverflow.com/2011/12/resuscitating-the-roof-providing-adequate-roof-ventilation/

In your situation I assume you have a flat roof that ties into an existing shingle roof. You will probably want a clear path from the soffit of the flat roof to the attic space of the existing roof.
 

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You need to create a ventilated air gap between the insulation and the roof plywood. The insulation can not directly touch the plywood. This page has some good pictures that explain it well:

http://diy.blogoverf...of-ventilation/

In your situation I assume you have a flat roof that ties into an existing shingle roof. You will probably want a clear path from the soffit of the flat roof to the attic space of the existing roof.
You don't need to do that.
Just drill holes in the roof to allow moisture to escape.
[That was a joke]
As others have said ypu need ventilation. Air needs to flow under the roof or moisture will be trapped and you will have problems
 
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