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drøn
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That’s not where the issue will be.
The vertical steel bars will act as a heat sink, so the internal aspect of the steel will get condensation at a certain external:internal temperature/ humidity ratio.
When it’s cold outside the steel cools towards the temp of the outside, which means that condensation forms on the internal aspect.
Cf coke can hot day.
I’m asking because I’m trying to solve this myself with a very similar construction- assuming your vertical steel beams are a single beam (ie no insulation between the internal and external aspects.