WUFI

Manfred,

Thanks for your response. Just to be clear, you are recommending that the moisture source be located in the actual membrane material rather than the air layer, correct? Does it matter if this is one or several elements?

Thanks,
Jay

I am simulating a wall with brick exterior, air space, vapor barrier, exterior sheathing, steel stud with batt insulation and interior gyp board. I am attempting to follow the ASHRAE Std. 160 rain penetration requirement which states that 1% of the water reaching the exterior surface should be depos...