Brick veneers are essentially transparent to water. Wood clapboards, fiber cement siding, and vinyl siding also leak, each in its own special way. In the real world all claddings leak sooner or later. They always have, and they always will. When your cladding leaks, neither caulking nor sealants will keep water out of your building. So if all claddings leak, and all sealants and caulks fail, how can we keep buildings dry? By creating a water management system beneath the cladding: a continuous drainage plane with integrated flashings and weep holes, with an air space between the cladding and the drainage plane where water can flow.