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How to deal with damp in your home
Use the right paints and sealants.
Use a water-based paint system as far as possible to ensure good breath-ability and for preventing vapor pressure build up. For the window frames and glass joints, use a good quality sealant.
Use a flexible silicone sealant in your kitchen and bathrooms, too, to seal the edges of your back-splashes and showers/tubs. Check if there are cracks around the windows or any wall penetrations.