I am about to embark on a repipe of old cast iron pipe that is about
90+ years old but as I examine and design I find both hot and cold
pipes that run straight up into the attic which has nothing but
bedrooms in it, the pipes of course end and are capped at the top. My
question is were these pipes installed for possible furture growth of
having water upstairs or are they for water pressure, flow or serve
some other engineering function?
Mark's right about future growth.
They are more than likely galv iron, not cast.
More importantly, 90 years ago, the Cold supply piping
was often used for electrical grounding purposes-to ground
switch/outlet boxes and lighting fixtures, especially in
baths and kitchens.
If they did in this house, you will lose all those grounds when you
abandon the old galv piping.
Just a "heads up" so you can check into it now.
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