| There is extra risk of course. Good ventilation is required through a counter-flow heat-exchange. This typically gives you the problem of too low humidity, as you remove humid air and get condensation in the heat exchange. There is risk of condensation in the walls. The internal warm layer is airtight, but the walls need to be ably to breath to the outside. Your wood can rot if you make mistakes here, especially on small leaks in the airtight layer. So air-tightness actually is needed to prevent too much condensation in the construction. This all supposes that warm is inside and cold outside, as is typical where I live. In reverse conditions, with hot humid weather and cooling inside, condensation is likely in the walls, as the airtight layer is on the cold side of the wall now. So condensation in the construction is unavoidable. I used an online calculator to decide my material use [1] to estimate how often it does happen, and how long it typically takes to dry. Inside my home, I need a humidifier, this winter it was often below 30%. [1] https://www.ubakus.com/ |