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The r value of my wall is 28. I have 39 in my attic now, I will have R-60 this fall.
Sheet foam cost? I believe that they were about $12 per 4x8 sheet.
The diagram is similar to my house, but I have no soffit vent. I had an ventilated drip edge installed with the exterior remodel, which provides me the ventilation I need up there. The difference is that I went overboard, and where diagram has fiber insulation, I still have more board there. I love foam board.
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