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Insulation Discussion Forum • View topic - Insulation for a patio roof? To vent or not to vent?

Insulation for a patio roof? To vent or not to vent?

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Insulation for a patio roof? To vent or not to vent?

Postby jfriebel » Mon Dec 17, 2012 5:25 pm

I have a patio that was added onto the back part of my house. There are three sloped roofs that run onto the almost flat patio roof. I have had ice damming problems since I have moved in and the leaks have caused ceiling damage. The roof has been resurfaced and now I am trying to figure out what to do with insulation to help reduce ice damming. Once the ceiling and insulatino was removed I could see why there were issues. The outside venting wasn't getting into the area above the insulation due to the insulation being jammed into the joists blocking off air flow. The patio roof was pretty much laid on top of the house and the venting for the house roof was supposedly being used for the patio roof also. The problem was the insulation was covering the vent holes into the main house and the vents are at the height of the patio ceiling not the patio roof.

My main question is to help with decreasing issues with ice damming do I insulate the underside of the roof and forget about venting or insulate above the ceiling and trying to vent the roof properly which will be a question for another professional.
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Re: Insulation for a patio roof? To vent or not to vent?

Postby SIM » Thu Jan 17, 2013 3:44 pm

You will get a variety of opinions on this topic, but for certain you should insulate the top of the ceiling before you insulate the roof. But if you live in the Midwest and the attic height is minimal the standard practice would be to dense pack the entire attic area and not worry about venting. In other words treat it like a sidewall. In that case you would add cellulose insulation up to a height of 15". Since you said the slopes are very low I am assuming the max height is less than 15". A picture would be helpful :)
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