There are plenty of good solutions for permanent air sealing which are not Spray Foam Insulation. Here is a good article about why you should avoid Spray Foam as much as possible: https://foursevenfive.com/blog/is-foam-evil-a-new-paradigm-of-foam-less-is-more/23
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Mineral wool is an excellent exterior insulator. Like any product in the building assembly, it must be used correctly and should be detailed to avoid bulk water leakage. It does have considerable embodied energy, but not much different then many... (More)
We use both in our projects depending on the situation.
The cellulose is nice cus' its healthy for the installers, low embodied-carbon (recycled paper) and easy to install well as either denspack or loose-fill (attics). The down side is it... (More)