Furring out walls for insulation?
so from my understanding, I wll need to furr out all of my existing 2x4 walls in my attic (approx 825 sft) so I can use R-19 insulation.
A heating/cooling rescheck was done from the building inspector, and in order for my attic renovation (house is only 3 years old?) to pass inspection or to continue, the walls around the windows in attic need to be furred out to be 5 1/2 inches for r-19 insulation.
There are alot (5) of window dormers in the attic, so my question is can we use 2x3 which would bring the wall out 6 inches? What potential issues can happen by doing this?
The cathederal ceilings are 9 inches would be R-38..
Any other ideas?