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Our building circa 1970 and 26 apartments is experiencing leaky rusted copper and steel large diameter pipes typical of the era.
Do forum members have stories of what to do or who to use to refresh or replace these pipes which (some of) run from top to bottom.
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Tender to several builders and you’ll probably need a PM for the magnitude/co-ordination of the works.
If you don’t have funds, you’ll need to raise capital via an AGM/EGM.
I am surprised that the copper pipes have corroded to the extent of needing replacement, even in a 70’s building unless its down to poor workmanship in the installation. The steel pipes not surprising. For the copper, there could be underlying problems that have caused early failure such as expansion and contraction, structural issues, dissimilar metals in contact with copper. Given the likely high cost of replacement, I would suggest that you initially have an expert report on the reasons for early failure and recommended approach to rectifications before launching into replacement. A hydraulics engineer or very experienced plumber would be the type of expert to talk to.