What is the over lap for 25mm steel in slab?

The overlap for 25mm steel reinforcement bars in a concrete slab typically follows the guidelines set by the relevant building codes or standards, such as ACI or Eurocode. Generally, the minimum lap length is around 40 times the diameter of the bar, which would be approximately 1000mm for a 25mm bar. However, this can vary based on factors like concrete strength, exposure conditions, and whether the bars are in tension or compression. Always consult local codes for specific requirements.