When piping through an exterior concrete wall, how must the pipe be treated within the wall?

When piping passes through an exterior concrete wall, it is essential to ensure that the pipe is both protected from damage and properly sealed to prevent any air or water infiltration. The correct treatment is to sleeve the pipe within the wall and seal the sleeve to address these concerns.

Sleeving refers to placing the pipe inside a larger diameter pipe or a protective sleeve. This technique allows for slight movement due to thermal expansion or contraction while also safeguarding the pipe from the abrasive qualities of the concrete. Additionally, sealing the sleeve ensures that there are no gaps that could allow elements such as water, moisture, or cold air to penetrate through the wall, potentially leading to corrosion or insulation issues.

This proper treatment helps maintain the integrity of the piping system and promotes safety, especially for systems that may be carrying gas or other sensitive materials.