Walls can get wet from the inside, walls can get wet from the outside. Walls can start out wet. Wet happens. Because wet happens, walls need to be designed to dry. We can and should do our best to keep them from getting wet. But no matter what we do we have to accept the fact they are going to get wet. All of them are going to be wet at some point. Joe takes on water and walls from both sides now in this edition of Building Sciences.