26 Sep '13, 7pm

Final insulation questions for wall and attic #green

Ok...I'm getting ready to finish up insulating my interior walls and my attic. Walls: I have built out a modified mooney style wall. I have place 3" XPS into the cavity spaces and will be putting insulation webbing and blowing in cellulose to finish out the 2.5 or so inches between the XPS and the webbing. When the wall is complete before my question is answered the walls consist of: (from the inside out) Insulation webbing/2.5 cellulose/3"XPS foam sprayed gaps/1x8" TNG sheathing/Original siding from early 1900's. I will be residing with either cedar or some fibre cement style siding in the future. My questions on this: 1.Do I need any type of additional barrier between the webbing and the drywall? 2. Is it a problem to add a layer of foam to the outside of the wall before I put on a house wrap? Ceiling/Attic: I have decided to simply blow in about R55-60 above my ceiling ...

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