What should never be used under scaffolding for support?

Bricks or pallets should never be used under scaffolding for support because they may not provide a stable and secure foundation. Scaffolding relies on a solid and level base to ensure the safety of workers and the integrity of the structure. Materials like bricks or pallets can shift, break, or fail under load, leading to potential collapses and accidents.

In practice, ideal materials for supporting scaffolding should offer a uniform weight distribution and be capable of withstanding the stresses imposed during use. Other options mentioned, such as sandbags, concrete blocks, and rubber mats, when used correctly and in appropriate situations, can provide better stability or serve specific functions, such as leveling uneven surfaces or adding weight to prevent shifting. However, bricks and pallets inherently lack the necessary structural integrity and reliability for scaffolding support.