July. Big Foam Insulators installed a water-based, open cell spray foam insulation under our roof sheathing, 5 1/2" thick for an R-24 insulation value. Would have loved to foam the walls, but due to price went with the R-19 pink fiberglass batts in the 2x6 walls. The energy savings are greater in the roof than the walls, so that's where we put our money.
For sound insulation in internal walls and under the floors of the upstairs bedrooms, we bought and installed used fiberglass batt insulation that Bearded Brothers salvaged from a commercial building remodel.
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