Need help on RSJ condensation

[timsterboss]

Hello, today I've seen some patches on plasterboards and it was getting wet without any leakage. Upon further investigation, condensation on steel beems were seen.. before plastering it over, please can someone recommend what it needs to be done? (Appreciate if you can give me a name or link to the materials too)
I don't want to board it and get condensation on RSJ again and ruining new boards...
Thank you

 

[John D v2.0]

Is it an external wall above? Could externally insulate the wall if possible. Also add a vcl behind the plasterboard