This course examines the design and construction methods of systems designed to withstand water penetration. An understanding of these systems gives us a starting point for finding sources of intrusion, and a discussion of how to best repair them and prevent further damage. Sealing a failed envelope is the first step in remediation. Once the source of the problem has been addressed, steps can be taken to reclaim full use of the built environment. Assessment of moisture damage must then be done, to best determine and prioritize steps to be taken toward repair or replacement of damaged components. Immediate and critical remedies are examined, as well as those which can be addressed after a couple days have passed. Then, for the sake of health, moisture driving the growth of mold must be found and eliminated, as well as the mold itself.