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What to do to stop heat conduction in the attic?

Dampness in the attic. The heat comes from the inside wall. I wanted to board up my attic (not OSB, but boards with diffusion slots). I noticed a spot where condensation is already visible even without the boards.

The heat is coming from the interior wall. The surface is not insulated and heat radiates in all directions: The ceiling is drywall, with foil and a thick layer of insulation (wool).

 What can I do to the masonry now to stop the heat conduction?

• attic
• dampness