A variety of factors—changing economic conditions, concern for historic preservation, emphasis on fully utilizing conveniently located structures, space shortages, and increasing cost of materials and products used in the construction of new buildings—has resulted in a need to evaluate and more fully utilize the existing building inventory. To this end, this Standard (an update of ASCE 11-90) provides the design community with guidelines for assessing the structural conditions of existing buildings constructed of combinations of material, including concrete, masonry, metals, and wood. This volume contains of an overview of preliminary and detailed assessment procedures, of materials properties and test methods, and of evaluation procedures for various physical conditions of the structure. This Standard will provide a much-needed resource standard for building condition assessment for selected materials and for other areas related to the structural performance of buildings. Professional engineers, building owners, and regulatory officials will find this Standard invaluable.