Our ~80 year old house has a flat roof. The roof itself is doing fine, but in the middle of it there is a roof drain, made of cast iron pipe.
Last winter we started getting water leaking in, and I traced the problem to the roof drain, which had partially rusted through just below roof. I managed to patch it with duct tape and spray on sealant, but I don't imagine that qualifies as a permanent fix. I'm also not sure of the state of the rest of the drain.
The complication is that just below the roof, the pipe takes a roughly 90 degree turn, and has about a six foot horizontal run through the attic before turning vertical again. That horizontal run is inside the dividing wall (it is a semi-detached house), with only the two bends exposed to the general attick.
I'm trying to figure out if there is some way I can tell if the pipe is in good condition elsewhere, and how to replace the bit that connects to the roof. If I have to replace the whole pipe I don't think it would be possible without ripping a long slot in the roof, and I'm hoping to avoid that!
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