a stool refers to a support used in reinforced concrete to ensure adequate cover for the bottom reinforcement . This is a crucial component in concrete construction as it helps maintain the correct positioning of the reinforcement, thereby adding strength to the structure and controlling cracking of the concrete .

The use of stools is an essential aspect of reinforced concrete construction in Australia, and their design and placement must comply with the relevant building codes and standards, including the National Construction Code of Australia.

Stools can be made from various materials, including plastic, metal, or concrete, and are designed to withstand the weight of the rebar and the concrete being poured. They come in different sizes and shapes to accommodate various rebar configurations and concrete cover requirements. Proper use of stools is essential for ensuring that the reinforcement is properly embedded within the concrete, which helps prevent issues such as cracking or structural failure.