Thin stone building cladding is part of a system that includes a supporting framework, a means of cladding attachment, provisions for windows, and a means of shedding or directing water. All these aspects are necessary to complete the exterior skin. Part 1 if this series recommended a series of initial tests to determine the properties of stone being considered for a project. This article recommends tests during design and construction that help predict the stone cladding's performance in place. TESTING FOR DESIGN Wind tunnel tests performed on detailed building models can help determine design and wind loads and alert the designer to areas of the building that may be subject to unusually high wind loads. One good reference, ANSI A58.1, "Minimum Design Loads for Buildings," defines inward and suction loads for exterior building cladding. Structural connection tests measure the ability of the connections to support design loads with the proper safety factor. Full-sized panel tests are necessary because actual stresses in wall panels are complex and affected by support conditions. Serviceability tests should be performed on a full-scale mock-up of the cladding system to measure its resistance to air and water infiltration. Tests should be performed in accordance with the ASTM E 283 air leakage test and the AAMA 501.1 and ASTM E 331 water penetration tests. Sealant tests should be performed to evaluate adhesion, staining, and overall compatibility of sealants with the stone to be used for the project.