So I opened up a wall and discovered 1x6's nailed to it all over. Possibly used as an old form of sheathing back when the house was built. I think this was an old exterior wall that eventually became an interior wall. I need to remove the strips to insulate, add electrical, make the new wall line up with the door jamb, etc. Is there anything I should worry about as far as the wall's shear strength? I know that sheathing can also serve a structural purpose. Is there any way to brace it flush somehow without protruding from the front? This is for a small foyer room which opens up to two separate doors for a duplex.
Yes, that is how sheathing was done back then(before plywood), and it can probably be removed without any structural issues. I would not remove the whole wall, however, without a professional look-see.