Once you have more than about 150mm (6”) of insulation a typical building will be losing more energy through air leakage than through conduction. CLT in particu

Once you have more than about 150mm (6”) of insulation a typical building will be losing more energy through air leakage than through conduction. CLT in particular is excellent for airtightness because it is pretty airtight in of itself and it comes in big accurately machined panels which minimises the number of joints that need to be sealed up.