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Ryland · 11-16-11, 08:13 AM

I think that sheathing should get the greater structure, its not going to be as cheap as sheet foam, but caned expanding (great stuff) foam will help stiffen any cuts you make, of course it will also bridge the thermal gap you created, giving a greater R value then the wood had but not as good as the air gap, best would be a reflective insulation in the gap and in the stud space.

11-16-11, 08:13 AM	#4
Ryland Master EcoRenovator Join Date: Mar 2009 Location: Western Wisconsin. Posts: 913 Thanks: 127 Thanked 82 Times in 71 Posts	I think that sheathing should get the greater structure, its not going to be as cheap as sheet foam, but caned expanding (great stuff) foam will help stiffen any cuts you make, of course it will also bridge the thermal gap you created, giving a greater R value then the wood had but not as good as the air gap, best would be a reflective insulation in the gap and in the stud space.