Originally Posted by
Mike Schulz
the other units storage room looks just like it and on the other side of it.
The rock wool is draft stop to the common shared roof.
Then the common wall between the two storage rooms should go all the way to the "common shared roof" (it would be the fire rated wall separating the two different town homes) and the roof sheathing would been to be fire retardant treated to 4 feet from each side of that wall (not measured from the wall center line, measured from each side of the wall).