Thank you for your prompt response! I did not install any joint flashing. The sealing was done with KSK (which adheres very poorly to Neopor). The lower and upper edges were skim-coated. The horizontal barrier is just a formality with sealing slurry. At the top, I also skim-coated with Remmers MB 2K. It is not significantly more expensive than KMB. The house is far from finished, but it is already apparent that the basement is not completely dry. Could I contact you directly (exchange phone numbers)? Unfortunately, I cannot send personal messages yet, but you can surely send me one. I want to learn from others the critical points to consider while I can still take action. Windows are not installed yet, flat roof is coming soon. Best regards