What is the best insulation to use for a Passive House?

There are no strict rules in this regard. The critical issue is to achieve the U-values (thermal performance) required as identified by the PHPP. Thereafter, you can use whichever insulation type you prefer or can afford, whether polystyrene, cellulose, polyisocyuranate, strawbale, sheep wool and so forth. Some insulation types are better performing than others, requiring thinner walls, whereas other are less efficient and will require thicker walls.

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