A tightly sealed dwelling or flat, exactly where a great deal of h2o vapour is generated that cannot escape through fantastic ventilation, will inevitably cause The within air turning out to be saturated to the point that the excess h2o vapour starts to condense on to colder non-porous surfaces - https://edgarxchmo.blogpostie.com/48963443/the-2-minute-rule-for-london-sw3-secondary-glazing-services