WRB —weather resistant barrier
Since were are on the subject of WRB's, this is a good time for a fun fact! Tyvek is the ultimate WRB in this contractors opinion. Technically, it is the equivalent of grandma knitting the perfect sweater —holes small enough to stop a water molecule and large enough to pass a vapor molecule.
Fun Fact —the background for this website is Tyvek
Fun Fact —the background for this website is Tyvek