Gather the lumber to be used for the walk planks. Fasten the support securely to the leg using five nails, and make sure that the vertical legs stand erect on solid ground. Nail the other end of the support to the vertical leg, flat side to flat side, at a distance three feet from the wall. Holding the 2x4 level, perpendicular to the wall, and flat against the butt end of the scab block, nail through the end of the support into the butt end of the scab. Cut 2x4’s four feet long to be used as the horizontal supports on which the walk planks will rest. Step 2 - Erect the Horizontal Support Beams and the Vertical Legsįor one level of scaffolding, you’ll need 2x4 supports five feet long set vertically every 10 feet around the perimeter of the house. Nail the blocks every 10 feet with one end aligned with each vertical leg at a height of four feet above the grade. If you can’t fasten the block securely to the studs, you’ll have to remove enough of the exterior cladding so that the blocks can be nailed in place. If the house is being renovated and the exterior cladding is already installed, you may be able to nail through the siding material into the wood stud. If plywood sheathing has been installed, nail through the sheathing into the stud, nailing each block thoroughly and securely. The horizontal supports will be nailed to 2x4 blocks, or “scabs,” two or three feet long which are nailed flat directly onto the stud wall’s exterior surface. In new home construction, scaffolding is erected before installing siding and trim onto the built frame. Step 1 - Attach the Blocks or "Scabs" to the House Frame TIP: Building scaffolding is a big project, so before you start work consider the work and time involved and whether it's best to get several friends or assistants to help.