Was wondering what thickness of insulation do you use in ceiling of garage. Do you use the same as trusses or go thicker, if its 2x4 truss use 3 1/2" insulation or go to a 5 1/2" thickness.Was quoted a r40 which is 11" thick which I thought was totally wrong, or am I wrong. Any thoughts or suggestions would be greatly appreciated.
What thickness of insulation for garage ceiling
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