The annular space between the outside of a pipe and the inside of a pipe sleeve must be sealed with what?

The correct response indicates that sealing the annular space—a gap that exists between the outer surface of a pipe and the inner surface of a pipe sleeve—can be accomplished through various methods, including concrete fill, a gasketing system, or foam sealant. Each of these materials serves an essential function in maintaining the integrity of plumbing installations.

Using concrete fill provides a robust structural support that can also assist in protecting the pipe from external forces and environmental factors. A gasketing system creates a tight seal that helps prevent the ingress of moisture and contaminants, while foam sealant offers flexibility, ease of application, and excellent sealing capabilities for irregular surfaces.

Since different applications may call for different sealing methods based on conditions such as the environment, pipe material, and specific design requirements, all three methods are valid and sometimes necessary. Therefore, indicating that all of the above can be used as sealing solutions reflects the comprehensive options available for achieving a proper seal in plumbing practices as outlined in the International Residential Code.