Airtightness requirements

For buildings with no ventilation system, n50 must not exceed 3.0; for buildings with a ventilation system, no more than 1.0 and for ISOVER Multi Comfort Houses, the requirement is less than 0.6.

An n50 value of 0.6 means that a maximum of 60% of the complete building air volume can escape per hour – with care, however, the n50 can be reduced to as low as 0.3.

The sketch shows the elements and components of a building, namely membranes, plasters, concrete, windows and doors, that contribute to airtightness.

What does n50 mean?

n50 expresses airtightness in numbers, and indicates how often the air volume of the building concerned is exchanged per hour at a pressure difference of 50 Pa.

What does n50 mean?

n50 expresses airtightness in numbers, and indicates how often the air volume of the building concerned is exchanged per hour at a pressure difference of 50 Pa.

What does n50 mean?

n50 expresses airtightness in numbers, and indicates how often the air volume of the building concerned is exchanged per hour at a pressure difference of 50 Pa.