How far must a shield plate extend above the sole plate if the latter is bored within 1-1/4 inches of the edge?

The requirement for a shield plate to extend above the sole plate is based on safety and structural integrity standards for plumbing installations. When the sole plate is bored within 1-1/4 inches of the edge, a shield plate must extend a certain distance above this edge to protect the piping from potential damage or physical impact.

In this case, the correct answer indicates that the shield plate must extend 2 inches above the sole plate. This 2-inch extension is designed to provide adequate protection and ensure that any installed piping is sufficiently shielded from the risks associated with penetration or other impacts at the edge of the sole plate. The additional height serves to prevent accidental contact or damage that could compromise the plumbing system.

If the other options suggested lesser or greater extensions, those would not align with the established guidelines that prioritize protecting the structural and operational integrity of plumbing installations. Hence, the requirement for a 2-inch extension above the sole plate adheres to standard practices in residential plumbing inspections.