When properly erected, welded steel frame scaffolding is rigid, safe, and strong enough to carry heavy masonry materials. Suitable for both large and small projects, it is the most common scaffold system used by masons in the United States today. But it must be erected and used correctly. Here are some scaffolding dos and don'ts. GETTING READY Inspect the equipment and make sure all scaffold components are sound. Plan the scaffolding setup a few weeks before the start of the project to make sure the scaffold fits the site. Provide a stable base and compact all backfill. Don't mix scaffold frames and parts, or skimp on scaffold accessories. ERECTING THE FRAMES Follow the manufacturer's recommended erection procedures. Use mud sills under the scaffold legs to distribute the concentrated leg loads over a greater area. Use adjustable screw jacks with fixed base plates. Join the frames with cross braces. Lay out the scaffold and side brackets so the planking is within a few inches of the wall. Don't omit cross braces, and don't block up bases with blocks, bricks, or lumber. INSTALLING THE PLANKING Inspect all planking before each use. Secure all planks to their supporting brackets. Don't use wood planks with loose or large knots, checks, splits, or prominent sap lines. PREVENTING THE SCAFFOLD FROM FALLING OVER Tie the scaffold to the building when the scaffold height is four times the minimum scaffold base dimension, as required by the American National Standards Institute. USING THE SCAFFOLD Provide a ladder or other equivalent safe access to the work platform, as required by OSHA. Do not climb frames not designed for climbing.