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Old 06-04-2013, 04:30 PM   #1
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If I converted to a finished attic, what do I do about the venting?


I currently have an unfinished, vented attic. I live in Iowa. I'm thinking about converting it into a conditioned space when I re-roof. Can I just insulate with foamboard above the roofdecking to bring the insulation to code and not vent it? Is this an acceptable approach in my climate?

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Old 06-05-2013, 06:42 AM   #2
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If I converted to a finished attic, what do I do about the venting?


Yes.

As long as the insulation levels are code applicable, that should be acceptable.

With high snow loads, the idea of above deck venting is also a great idea to help keep the sheathing at a very close to ambient temp.

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Old 06-05-2013, 07:41 AM   #3
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If I converted to a finished attic, what do I do about the venting?


What would that venting system look like? A ridge vent?
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Old 06-05-2013, 07:59 AM   #4
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If I converted to a finished attic, what do I do about the venting?


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What would that venting system look like? A ridge vent?
Small intake vent between foam and new sheathing as well as a ridge vent.

http://www.danperkinsroof.com/venting-and-insulation/
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Old 06-05-2013, 08:43 AM   #5
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If I converted to a finished attic, what do I do about the venting?


What do you mean "not vent it"? You need to tell us exactly what you are attempting to do. In most cases, an attic has knee walls at the sides, and collar beams to provide support for your new ceiling, so the area in question is the sloped area between the top of the knee wall and the ends of the collar beams. If you provide an air space of about 2 inches below the roof deck above the sloped area for convection air to reach the ridge vent you should be OK.

This assumes you have a typical gabled roof situation, with eaves and ridge venting.
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Old 06-05-2013, 08:51 AM   #6
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If I converted to a finished attic, what do I do about the venting?


That might be a problem because I only have gable cents now. A ridge vent could easily be done when reroofing but I don't know if it's possible to put eave vents on the type of roof I have. There are rafter tails that stick out under the eaves.
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Old 06-06-2013, 08:55 PM   #7
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If I converted to a finished attic, what do I do about the venting?


Pictures will help.

You can eave vent any roof whether it if via soffits or some sort of roof deck venting. Becomes more of a question as to if it is required.

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