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I need to replace the insulation in my attic , can I install faced fiberglass insulation over the existing vapor barrier.

Jeff Ainslie of Ainslie Group PRO answered:

Jul 11, 2019
The best move would be to simply make sure the existing vapor barrier product is installed properly (flush to ceiling below) and add blown insulation over top to to get the best R value and at the lea ... read more
What size nails are required for Structural insulated sheeting .5 inch foam board.
Aug 15, 2014
+1 to the previous comments. Depends on what the foam manufacturer specifies as well as what the exterior sheathing is going to be. I would also recommend a thicker foam for additional insulation and ... read more

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