27 Nov '11, 3am

What is the r-value of this roof? #leed #eco #green #building #yeşil #bina

As I look at this assembly, I wonder.... If there's only 6.5ish inches of sprayfoam under the sloped ceiling, can they really call this an r60 roof?? And then I think... Does it really matter? It looks like the peak and knee walls are r60. What's the loss at this sloped ceiling? Is a sloped ceiling more like a wall than a flat ceiling and thus r40 is enough? Or maybe I'm just not interpreting their drawing correctly.

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

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