Retrieving "Pre 1970s Wall Systems" from the archives

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1. Moisture Vapor Transmission

   Linked via "pre-1970s wall systems"

   While direct vapor pressure drives bulk MVT, the Hygroscopic Imbalance Factor ($\Psi{HI}$) plays a critical secondary role, particularly in organic materials like wood and natural fiber insulation. $\Psi{HI}$ describes the material's tendency to actively adsorb or desorb moisture in response to subtle shifts in ambient [$\text{CO}_2$ concentrations](/entries/carbon-dioxide-…