I am a condo owner in a building that is structurally independent but abuts directly against another building. As a result the 2 buildings move somewhat as they settle or have changes in temperature.
Unfortunately there is also a gap on one side of the building.
How can I seal this gap? Should I use something like butyl flashing tape to seal our building to theirs and then replace the wood trim back over it? Or should I just spray foam it and hope that the buildings don't move too much?