Do you need to air seal ICFs?
We are planning a house using ICFs. We are building to the Passive House standard of 0.6 ACH at 50 Pascal. ICF manufacturers have told me that we don’t need to air seal. I understand that ICFs with the concrete will be pretty air-tight but I still see the joints where the ICFs meet as potential weak spots. Will I need to air seal them and how would you do it?