Ed_Fako
May 26, 2007, 4:21am
33
I’m thinking that virtually no one on these boards have ever had a subscription to the newsletter Energy Design Update or if they had they did not believe what they read. In the July 2006 issue (I believe;can’t find my copy at the moment), a Building Science Corp reseacher measured roof temps of dark roofing materials in Jacksonville, FL during the month of August. Yes, he found that the unvented roofs had higher temps at their surface (the hottest part of the shingle since the sun hits there) but over the month the average temp rise on the unvented roof surface was something like .2 degrees F, not likely to cause shingle failure.
Brian,
If I remember my readings correctly, that paper was written regarding unvented “cathedral or vaulted cieling designs”, which have a completely different trapped air containment than the typical attic structure.
Ed