I would like to properly install a firewall in my utility room, on the wall that is shared with my house. (I have a utility room that is similar to a garage, next to my house.) The wall, however, has my hot water heater, laundry machines, and utiility sink, as well as pipes running along it. I think it is going to be very difficult to drywall this with no openings. Is there a special method to addressing this madness? I can pull out the laundry machines, and am replacing my water heater soon, but I still cannot move the pipes.