Minimum size of scaffold plank?

• A. 2"x 10"
• B. 1"x 6"
• C. 2"x 8"
• D. 4"x 10"

Answer: (A)

The safe standard for scaffold planks requires enough thickness and surface area to support a worker and tools without excessive flex or risk of failure. A 2-inch-thick by about 10-inch-wide board provides the essential strength and stability for typical scaffold spans. A thinner board (like 1x6) would be too weak, and a 2x8 is narrower than the common minimum width used in practice. A 4x10 is not necessary for normal scaffolds and adds unnecessary weight. In most settings, 2x10 planks are considered the minimum standard for scaffold platforms. (Note: actual lumber dimensions are slightly smaller than the nominal 2x10, but the nominal size communicates the required strength and surface area.)