Describe how a cavity wall works and sketch its major construction features. What aspects of cavity wall construction are most critical to its success in preventing water leakage? Where should flashings be installed in a masonry wall? What is the function of the flashing in each of these locations? Where should weep holes be provided? Describe the function of a weep hole and indicate several ways in which it may be constructed. What types of movement joints are required in a concrete masonry wall? In a brick masonry wall? Where should these joints be located? What are some ways of insulating masonry walls? What precautions should be taken when constructing masonry walls in Minneapolis in the winter?