Our ~80 year old, semi-detached (side split) house has a roof drain that drains through a cast iron pipe. Right near the roof, where it is most exposed to the environment, it rusted through from the inside last winter. I put on a temporary patch, and am now trying to figure out how to do something more permanent.
The first question is do I just need to replace that small piece, or the whole pipe? Complicating things is that most of the pipe is in the party wall, so not easily accessed.
Is there some way, other than looking at the inside of the pipe or cutting through it to tell what sort of shape a pipe like this is in?
Any advice is appreciated!
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