During a typical month in the United States, a building construction worker is killed and 12 are injured by falling walls. Occupational Safety and Health Administration (OSHA) regulations for bracing masonry walls during construction are woefully inadequate. The American National Standards Institute (ANSI) requirements for bracing masonry walls during construction are insufficient, inaccurate, and antiquated. Model building codes also lack sufficient guidelines for bracing masonry walls. What's more, the safety manual published by the Mason Contractors Association of America (MCAA) doesn't have a word on bracing. Masonry researchers have not been interested in the bracing of masonry walls during construction. The International Masonry Institute's Masonry Bibliography lists 8,109 publications on masonry between 1830 and 1990. Only three are on bracing. During the three-year period, 1992 through 1994, 50 workers were killed by falling walls. In 1993 in the United States, 148 building construction workers were injured by falling walls. The median number of days away from work was 28. The author conducted personal interviews with 10 masonry contractors in Texas on the subject of bracing masonry walls during construction. Four said they do not currently bid on mercantile buildings with high freestanding bearing walls. These contractors have very little need for bracing because walls are tied to frames. Six of the contractors had experienced walls blowing down, five with no injuries, one with two men killed. Seven of the contractors typically use conventional 2x10x16-foot scaffold boards to brace masonry walls. Three contractors have used tilt-up concrete braces. Two contractors said they have very little confidence in scaffold board bracing. Only one of the interviewed contractors normally includes bracing in his bids. Five never or very seldom include bracing in their bids, and two always specifically exclude bracing from bids, leaving bracing to the general contractor. The proper bracing of a masonry wall depends on these variables: wind probability and pressure, wall height and length, local terrain, geographic location, and strength of the masonry (governed by wall type, wall thickness, mortar type, and cement type). The typical brace ignores most of these conditions and is in violation of the National Design Specification for Wood. Proper scaffold boards--much less cheaper substitutes--are inadequate when used as braces. Among other things, their thickness-to-length ratio is excessive for a compression member, and these boards are almost never knee-braced.