Since 2007, I've been arguing against vented attics, which are the most common way to make a roof for a house.
Around that time, the IRC started allowing unvented attics that are insulated at the roof plane with foam.
This spray foam method has proven to be expensive and dangerous, so I've been hoping for a better way.
Once again, David Posluszny, inventor of the Shirley Wall, has provided a solution:
http://foursevenfive.com/unvented-foam-free-roof-retrofit-with-dolphin-insulation/
This is still a difficult installation process in a retrofit, accessing the soffit area is tough.
But if you are building a new home with a cathedral ceiling, this will be relatively easy and cheap. The furring strips make it easier to install drywall. As usual, don't install any electrical in the ceiling due to the air leaks it can cause.
Around that time, the IRC started allowing unvented attics that are insulated at the roof plane with foam.
This spray foam method has proven to be expensive and dangerous, so I've been hoping for a better way.
Once again, David Posluszny, inventor of the Shirley Wall, has provided a solution:
http://foursevenfive.com/unvented-foam-free-roof-retrofit-with-dolphin-insulation/
This is still a difficult installation process in a retrofit, accessing the soffit area is tough.
But if you are building a new home with a cathedral ceiling, this will be relatively easy and cheap. The furring strips make it easier to install drywall. As usual, don't install any electrical in the ceiling due to the air leaks it can cause.
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