Hello

I wonder if it is possible to insulate the facade with polystyrene insulation boards directly on the old facade?

Best regards
 
Welcome to the forum!

It is possible, but not recommended.

If you have a bad träfasad, I suggest you instead take down the panel, add crossing battens, insulate with mineral wool, apply Örnpapp or Windy, and nail on a new façade.
 
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