What is the annular space required for PVC pipe passing through concrete walls and floors?

The correct requirement for the annular space when PVC pipe passes through concrete walls and floors is indeed 1 inch. This clearance is established to allow for proper movement and expansion of the pipe. In situations where temperature fluctuations occur or when the structure settles, the annular space prevents stress on the pipe that could lead to damage or leaks.

The significance of maintaining this space also relates to proper waterproofing and sealing around the pipe, particularly in below-grade applications where moisture could easily compromise the integrity of the plumbing system. A minimum of 1 inch ensures that there is adequate room for sealant materials to be applied effectively, aiding in creating a water-tight installation.

Other distances listed, such as 0.5 inches, 1.5 inches, and 2 inches, do not meet the specific code requirement. A smaller distance would not provide the necessary space for movement and support, while larger distances might lead to unnecessary voids that don’t contribute to the structural integrity of the pipe installation. Thus, a 1-inch annular space is the standard set forth in the Massachusetts Plumbing Code to balance safety, flexibility, and structural support.