According to PhotoMan :

"Gary Tait" wrote :

If it is old enough to not have insulation, you probably have a ballon
framed house, which will have no firestops.

BUT - how are firestops dealt with IF they are present?
Joe Arnold

Another row of holes.

Or you figure out whether you can remove&replace siding.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.