We're doing 4x8' wood panel sheets to serve as walls in the basement (mainly to serve as a media and kids play room). The carpenter framed/furred out with 2x4's due to the wonkiness, bowing and varying heights of walls and basement. We (the homeowners) didn't really think about insulation before starting this project which was a mistake. Based on the wall details below and the pictures provided, what are our options to insulate this space at this point?
- The walls' height range from 80" to 86" (to ceiling joist)
- The walls' being paneled (furred from) are exterior and made up of concrete wall on the bottom and timber framing on top and the latter sits back roughly 2 1/2" from the front of the concrete
- The concrete portions are below ground level, their height varies from 40" to 46" throughout and they bow in most areas
- The timber framing portions are above ground level, are uninsulated, their height varies from 37" to 43" throughout and there's shiplap boards and then cedar siding as the finish on the exterior side
- Again to save space the carpenter framed with the 3 1/2" side of 2x4 studs facing the wall
- Because of the bowing and wonkiness of the concrete walls, the distance between the concrete walls and the start of the framing are 0" to 1" on one wall, 3/4" to 1 3/4" on another and 3" to 4" on another. The timber portion of the walls are 7" to 8 1/4" from shiplap to the start of the framing
- We're in Seattle, WA and the house is over 100 years old