Why not Rockwool for basement brick walls? Warm moist air won’t hit cold brick because insulation reduces temp before air meets wall. Condensation in batt?
I’ve read the articles Three Ways to Insulate a Basement Wall, “Insulating Old Brick Buildings”, and “How to Insulate a Basement Wall”, and most of the comments.
It still seems to me (perhaps I missed something) that rockwool batts installed between studs, floor to ceiling, would be fine because even on very cold days the dew point would be somewhere in the middle of the batt, so there’d be no condensation on the wall. (Right?)
On the other hand, I’ve never understood why it’s okay for the dewpoint to be in the middle of the insulation. Doesn’t that mean there’d be condensation in the insulation? I don’t know if it would get so heavy as to distort the insulation, but I think it would lose some of its R-value, and although the material itself is not a food for mold, if dust has gotten into it thru air flow then there could be some mold on the dust – unless when it’s warm enough for mold the moisture dissipates.
When my walls had to be torn down, I found the bottom two feet had zero insulation, so heat / cold moved between the interior and the 5″ airspace behind the insulation with ease, rendering the insulation of little-to-no value. Is it okay to have batts floor to ceiling? (on top of the wall frame’s bottom plate)
Toronto = zone 5
GBA Detail Library
A collection of one thousand construction details organized by climate and house part