The pink foam strips act as lifts on the roof walls to prevent any insulation from trapping moisture. These "Raft-R-Mate Attic Vent" boards as well as several types of "Roxul" insulation are sold at Home Depots.
The R value per inch for fiberglass insulation is 3.14, Roxul is 4.1, and closed cell foam would be around 5 for the rafter depth we have here. An install of 5" thick closed cell foam in the open ceilings of Christian's old farmhouse cost $3,000; however a partial house install does not work with this product. Spraying foam on old wooden beams, floor boards and electrical wiring seems wrong and too expensive for us besides. Single cell foam would be $2,000 for the same areas with the same issues and an R value of 3.7 per inch.
Five of the upstairs rooms in this farmhouse have had their plaster ceilings removed and recessed lights as well as fans in the bathrooms have been installed. Two layers of Roxul 2" X 4" insulation bats have been installed in two ceilings with deep enough joists, with single layers of 2" X 6" bats in the others.
The main bathroom below, had Roxul Safe & Sound also installed in the tub surround area which sound proofs the space from the adjoining guest bedroom.
Update: Below are the finished rooms...