question for insulating 1800's log home
I’m working on our 1800’s log home in Pennsylvania. Original home is 22 X 24. Just finished a 12 X 14 ft. two floor addition off the east side. The outside of the house was originally covered with vertical board and batten. At some point the battens were removed and they covered the board siding with the asphalt sheets with the brick pattern. Inside of the addition I exposed what was originally the outside wall logs of the house. They seem in good shape and I like the look. As I move inside and start working on the renovations I’d like to expose the logs in some of the walls. The interior side of all the outside log walls are covered in lathe and plaster and are in fair shape. My quandary is how to add some insulation to the walls especially if I’m exposing some of the log walls inside? I plan to apply fresh board and batten as exterior siding, returning it to its original look. A suggestion that I received and used on the southern exterior wall is to nail 1 X 3” horizontal nailers right over the “bricks” every 2 feet, applying 1” blue board between the nailers and going overtop of that with the vertical 1 x 10 inch rough sawn pine boards and battens. I will re-chink the logs on the inside but I’m thinking w/o the plaster there will be even more moisture going through the wall in the winter. So, how can I add some insulation w/o creating a moisture problem in the wall?
(home has a new metal roof with Icylene open cell foam at roof and on gable ends in attic. Addition has same insulation in walls and at roof.)
Thanks for any wisdom you can share.
One board at a time, preferably chestnut.