rear wall insulation:
The R value of the 1/2 foam insulation board is between 1.93 a 2.10. Other brands of the same material state 2.0 to 4.0
Here is a link to the product specification:
Please advise the inspector that there is an inch clearance between the existing ceiling and the 2 by 6 ceiling rafters. I lieu of pulling down 300 sqft of insulation, ask him if we can pull down a few rows and then feed 1/2 4 by 8 sheets of R2 foam insulation board.
The other scenario is pulling it down and then installing R23 from Lowes.
The final scenario is access areas to blow in insulation.