What percentage of waste allowance is typically added to concrete calculations?

In construction projects, particularly when dealing with concrete, it's essential to account for waste due to various factors, such as spillage, suboptimal mixing, or uneven pouring. The typical waste allowance added to concrete calculations usually falls within a range of 1% to 2%. This percentage helps ensure that there's enough material to complete the project without running short, while also recognizing that some concrete may inevitably be lost or unusable during the process.

By including a waste allowance in the calculations, contractors can accommodate any unforeseen circumstances that might arise on the job site, thus minimizing delays and additional costs. It's important to have a realistic understanding of how much material is actually needed versus how much might be wasted. This percentage is a standard practice in the industry and reflects a balance between efficiency and practicality when ordering concrete for construction projects.