caster iron pipes to quiet rushing water sound
I read somewhere that using cast iron pipes can be beneficial to down play the water fall sound that occurs everytime someone flushes. We wondered about a pipe that will go through a wall in our dining room, and whether we should get the plumber to put a cast iron pipe there for sound control. The plumber was not too keen on doing it, and he said the cast iron will rust eventually. Do you think we can get the same effect by just using spray insulation foam, or should we go for the cast iron pipes in this one spot? BTW, it is in an outside wall of a 2 X 6 wall.