What barrier should I use under wall shingles to increase insulation in a single wall cabin?
I have a 100 year old redwood cabin in Northern California in the coastal area.
It is single wall construction consisting of 1×12 redwood boards and framing visible on the inside, and with cedar plank covered by redwood shingle on the outside.
I am replacing the shingle and will be repairing damaged cedar plank as necessary.
I do not want to turn the cabin into double wall construction with interior insulation as it will wreck the character.
In addition to building paper, what can I use between the ceder plank and shingles to increase the energy efficiency of the cabin?
Please take into account that this old redwood should not be wrapped in a plastic bag as it needs to breath in this foggy climate.
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