February 20, 20242 yr As some of you know, I'm at the end (I hope!) of a major renovation. My place now has two kinds of wall insulation - both of them on the inside. - On the south side and a bit of the west side, I have a thick layer of BioFib Trio (cotton-linen-hemp), with an R>4. Everything should be fine there. There are some thin veils inside het - On the north side and bits of the west and east sides, due to sui generis advice/orders that did not come from here and may be questionable, there's a combination of a reflective insulator (Actis Hybris) and 5cm of BioFib Trio. People here have discussed plenty how well reflective insulation performs. Let me not do so here - suffice it to say that the north-side rooms are a bit colder (but then they would be: it is the north side). If Actis Hybris performs as its manufacturer claims, then the wall does surpass R=4. Let us just say that I am considering the possibility of insulating the north side from the outside, eventually, in the medium-long run, without touching what has been done already, if I can help it. Now, BioFib has the virtue of being a moisture regulator. Actis hybris, on the other hand, is meant to be impermeable to water vapor. What sort of outside insulation should I aim for, then, so as to avoid condensation issues? Porous? Not porous? Or am I neglecting other, more questions here?
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