Airtightness and mechanical ventilation
Ilais Igoumenidis| Posted inPassivHauson
What is the limit point, in terms of airtightness, that a residential retrofit needs mechanical ventilation (with heat recovery)?
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Replies
Ilais,
There are too many variables (and too many unresolved technical disputes) to answer your question with a simple answer. For more information on this issue, I suggest that you read the following article, as well as the comments posted below the article:Ventilation Requirements for Weatherized Homes.
The simple answer is that you need a mechanical ventilation system if you see condensation on the interior of your windows during the winter or if your house smells stuffy.