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Looking at the profile I would say it was older than 1970’s but it looks perfectly functional not sure why it has rusted so much is it in a humid location? Wire brush and paint with a couple of coats of red lead, which does not have lead in it anymore. Remember the lead a use a mask and keep well ventilated when you brush it down.
When you come to re plaster use at least 12.5 mm plaster board to give it a fire rating
Zebra_Cyclist
I’ve uncovered an old steel in the arch between my living and dining room (it was boxed in with wood and I need to plaster over so I’m redoing with plasterboard).
It looks to be from the 70s, based on the newspapers stuffed in there. Should I try and get rid of the rust and treat it? Or leave well alone.