Rock wool insulation?
For my partially sub grade bedroom space, I am averse to spray foam insulation because of the inconclusive endorsements I get when I ask if it off-gasses long term, even if correctly applied. No one from your organization or elsewhere seems to offer definitive endorsement.
So in considering alternatives, I read on your posts that rock wool insulation should not be used against a basement wall because air gaps allow penetration that will result in condensation. So Im thinking of lining the poured cement walls with rigid insulation and then using rock wool in the framing. And Im also thinking of using rock wool in the basement ceiling – between the basement and the first floor, partly because of its sound mitigation properties.
1- what do you think of this approach for the walls?
2-Is there a concern about micro dust fragments of rock wool gettiing pulled into the forced hot air system and getting into the air over time? Especially due to constant vibration on the basement ceiling from foot traffic on the floor above.
3. If that is a concern, we considered spraying the surface of the rock wool with some adhering product to trap loose particles on its surface and adhere it to itself. What do you think of this approach?
Hard to have good air quality with an insulated space below grade!
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