In 1988, OSHA set up bracing and limited access zone (LAZ) requirements for masonry walls. LAZ PRACTICES Contractors use the following methods for marking an LAZ: orange cones every 10 feet; "Keep Out" signs; 55-gallon barrels or wood horses with caution tape around the perimeter. BRACING PRACTICES To brace a wall, contractors cite experience and common sense as their guidelines. Some contractors follow "Bracing Concrete Masonry Walls During Construction," NCMA-TEK 72 from the National Concrete Masonry Association. WHAT IS ADEQUATE BRACING? Masonry safety consultant Peter Cucuz says "You need good quality 2x10s." He also recommends that contractors embed the stakes holding the inclined brace deeply into the ground. When the inclined brace is more than 8 feet long, OSHA recommends using a strut for support. Some contractors also take season or wind speed into account when bracing walls. COST OF COMPLYING Contractors generally make the cost of bracing and an LAZ integral to their bid rather than a separate line item. These costs generally account for less than 2% of the bid.