insulating existing house from exterior
I have a house built in the 40’s with little to no insulation on a north facing wall. I am stripping the siding off and replacing the windows. What would be the best way to add insulation to the walls? The interior is covered with expensive wall paper so from the inside is not an option.
Since it has skip sheathing on it, I thought I could remove some here and there and install open or closed cell foam from the outside.
The homeowners goal is to get a high r-value, which is why I ruled out the conventional blown in cellulose.
Any thoughts would be greatly appreciated.