Tomture61
Hello, there are usually many opinions on which brake/barrier to use in the building envelope of a building.

Can you provide advice for, for example, a building that is sometimes unheated?
A building that occasionally has high humidity (garage)?
A building with natural ventilation?
A building with cellulose insulation?
 
In general, one should think that if a building is warmer indoors than the outdoor temperatures for most of the year, a vapor retarder should be used because the vapor pressure from inside is greater. If the building is cooler indoors than outdoors for most of the year, a vapor barrier should not be used on the inside as the vapor pressure is higher from the outside.

If there is occasionally high humidity indoors, a moisture-controlled ventilation system or dehumidifier might be good to install.

When it comes to cellulose insulation, one should follow the manufacturer's instructions.
 
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