Relative Humidity, Vapor Retarders, and Mold Risk Calculations
All methods – all formulae – ignore vapor resistance (perms).
Surely scientists/engineers have a way to then, as a subsequent step, bring vapor retarders into the calculation of relative humidity. If not, that would surely guarantee major mistakes. How can you calculate relative humidity at a point in a roof/wall assembly if you ignore vapor barriers and vapor retarders?
Is there something I’m missing?
Seeking a formula for how vapor retarders affect mold risk, or at least a way to integrate perms into a mold risk spreadsheet, I ended up converting a printed spreadsheet [edit: calculating condensation in a wall assembly] into a functioning spreadsheet – almost.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part