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I am trying to develop a method of increasing the insulation in walls built in the PNW which does not interfere with the normative sequence or techniques of building used in the area. So to be clear this is a "pretty good" approach which doesn't require special trades or materials and can be used in typical houses without significantly increasing the cost, not boutique projects.
For better or worse the material of choice here is FG batts used in 2"x6" walls yielding a nominal R20. Can anyone suggest a wall assembly using those existing materials, that is wood and batt insulation, that would increase the walls efficiency, or comment on the results of using double walls, or other framing variants usually associated with blown in insulation?