Breathability is defined as a capacity of the water vapor to pass through a material mass. Resting human body produces about 0,75 L (2.500 g/m², 24 h) of water vapor every day. The more active is the use in a room, the more increases the water vapor per person and so increases the need to regulate the total amount inside this room as well.
Human skin is a simile of this phenomenon: when we have shower, water does not come in to our body, but when our body temperature is too high, it produces sweat through skin pores, to dissipate the temperature excess.
This should be an essential quality of the building solutions and materials used for the buildings where we live and work, to obtain a inside correct hygrothermal comfort level; stop water coming in from outside to inside and at the same time…
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