A scaffold system's configuration directly influences mason comfort, convenience, and downtime. And its ease of transport, assembly, and handling contributes greatly to a job's efficiency. Scaffolding, moreover, plays a critical role in jobsite safety. SCAFFOLD SELECTION Masonry contractors usually decide what scaffolding to use during the prebid process. Besides wall height, they consider safety issues, the number and positioning of projections and recesses, the type of building frame (when masonry is just the veneer), site accessibility, ground conditions, the availability of laborers trained for a particular scaffolding, whether cold-weather enclosure is necessary, and many other factors. VENEER SCAFFOLDING On interior or exterior walls 9 feet or less in height, contractors can use veneer scaffolding to improve laborer efficiency and mason productivity. Weighing about 35 pounds, the veneer frame consists of a 4-foot-wide panel, two attached adjustable legs, and two locking pins. TUBULAR-FRAME SCAFFOLDING The main components of conventional tubular-frame scaffolding are frames and cross-braces, which interact to give the system stability. But other components, such as screw jacks and connecting pins, must be maintained, making this type of scaffolding cumbersome to store, transport, and assemble. ADJUSTABLE SCAFFOLDING Most adjustable scaffolds consist of a base, towers, cross-braces, a carriage, winch assembly, guardrails, and planks. When turned, the hand-operated winch raises the carriage supporting the material and work platforms. POWERED MAST-CLIMBING WORK PLATFORMS Electrically or hydraulically powered mast-climbing work platforms generally consist of a trailer base unit, the platform, and one or two fixed steel masts on which the platform rides up and down.