When installing plastic waste piping below grade, what is the minimum clearance required around the entire outer circumference of the pipe or fitting when penetrating concrete?

The minimum clearance of 1/2 inch around the entire outer circumference of plastic waste piping when penetrating concrete is essential for several reasons. This space allows for proper thermal expansion and contraction of the piping materials, accommodating the natural movements that can occur due to temperature variations. Additionally, the clearance helps to prevent damage to the pipe from contact with the concrete, which could cause stress or cracks over time.

Moreover, having this minimum space around the pipe facilitates the application of any necessary sealants or insulating materials that may be required to prevent moisture intrusion or improve insulation. This practice is critical in ensuring the longevity and reliability of the plumbing system while also adhering to code requirements, which focus on safety and functionality in construction practices.