I am restoring a 1850s farm house in the Atlanta, Ga area. The existing exterior walls are old clapboard outside and old wood planking inside. No insulation and the outer clapboards are nowhere near tight; in places where the interior planking is gone or damaged you can see lots of light coming in through the outer wall.
Problem is I would like to insulate without tearing off either the exterior clapboards or interior wallboards, both are historic and for the most part in good structural shape. One idea I have been investigating is the use of injected foam. However I have been warned that the lack of ventilation will cause the old clapboards to rot.
I am also considering spray foam in the attic and under the floors. Again as much to seal all the cracks and openings as to insulate.
Any advice would be appreciated.