A pipe sleeve in a masonry foundation wall should be how much greater than the pipe passing through?

The correct answer is that the pipe sleeve in a masonry foundation wall should be two pipe sizes greater than the pipe passing through. This requirement is important for several reasons.

First, having a sleeve that is larger allows for easier installation of the pipe, accommodating any slight misalignments that may occur during the installation process. This is particularly relevant in masonry walls, where the construction materials can vary in dimensions and may not always be perfectly uniform.

Additionally, a sleeve that is two sizes larger provides necessary space for thermal expansion and contraction of the pipe, which can occur due to changes in temperature. This helps to prevent stress on both the pipe and the wall, reducing the risk of damage or failure over time.

Furthermore, the increased diameter allows for any potential future maintenance or upgrades. If a larger pipe is needed later, having a sleeve that is already oversized ensures that there will not be a need for additional excavation or structural changes.

In summary, specifying a pipe sleeve that is two sizes larger than the pipe enhances flexibility, durability, and future-proofing of plumbing installations in masonry walls.