Vapor Diffusion Through Open Cell Foam on Cathedral Ceiling

I’m having a tremendous amount of trouble understanding how vapor permeability and air impermeability interact in terms of moisture issues caused by open cell spray foam in a cathedral ceiling,… I’m having a tremendous amount of trouble understanding how vapor permeability and air impermeability interact in terms of moisture issues caused by open cell spray foam in a cathedral ceiling,…Read MoreGreenBuildingAdvisor