Almost all specifications make masonry contractors responsible for bracing walls under construction and liable for loss of property or life resulting from a wall collapse. WHY BRACE? Until the mortar gains adequate strength and floors and roof are installed, the wall usually must be braced. If it's not braced, even 20- to 30-mph winds can topple it. WHEN TO BRACE Based on the design wind speed and the height of the wall, the maximum height of an unsupported masonry wall can be calculated. In many areas, wind speed varies from season to season. Contractors should increase the amount of bracing during windy months. WHERE TO BRACE If the lateral spacing of the bracing is too far apart, the wall may collapse in the section between the braces. A table is provided that gives the maximum horizontal spacing of vertical bracing for hollow, nonreinforced concrete masonry walls subject to wind loads. HOW TO CONSTRUCT BRACING A typical masonry wall brace includes a vertical member, an inclined strut, stakes, and if necessary a strut-brace. WHEN TO REMOVE BRACING The National Concrete Masonry Association (NCMA) recommends a bracing period from 3 to 7 days depending on the curing conditions.