29 Nov '11, 3am

Green Building Q&A: unvented addition roof

Looking for some helpful advice regarding a currently unvented roof assembly. The house is about 100 years old -- there was a small 1-story addition done to the rear of the house. The back porch roof was extended to create a rear bedroom and bathroom. We are currently renovating the bathroom, and noticing that this section of the roof is unvented. There are no soffit vents, and no place for a ridge vent as the roof terminates into the side of the house (just below or at the 2nd floor). Currently there is a small amount of insulation in the ceiling below the roof. As far as I see it, I can only come up with 1 possible solution -- looking for help to know if this is correct. Since I cannot vent this roof easily, I am looking at unvented options. We just had this section re-shingled so I cannot add foam insulation above the roof deck. Does this only leave me with an option of...

Full article: http://www.greenbuildingadvisor.com/community/forum/gener...

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