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Cellulose is a fine insulation, we recently used cellulose insulation for the walls and roof of our latest demo house, the S1600 LEED Platinum Prefab kit house.
As for how to mount exterior rigid insulation, there are ways that employ more expensive materials, but save a lot of time so it sort of comes out in the wash we figure after having done it that first way.
Cascadia Clips is one such product, alternatively you could try Larsen trusses. You can read more here –
Larnsen trusses and cellulose insulation on the exterior of a Passive House.
And another that makes a lot of sense is ThermalWall exterior insulation panels from Legalett. They are made from EPS foam, and they have a metal rail in the middle of the panel that is used to attach them. What you do is remove the ‘snap track’ of insulation, fasten the panel to the exterior of the stud wall, the you replace the snap track and install your strapping to the same metal rail. The result is the same with what we did at the Edelweiss House, which is a seamless layer of exterior insulation with no screws that pass through the entire assembly to act as a thermal bridge. This looks like it would be the most affordable of the options.