How should the opening through the wall be made where water service piping enters a building?

The proper way to create an opening through the wall where water service piping enters a building is to ensure it is made watertight. Making the opening watertight prevents water infiltration that could lead to moisture problems, mold growth, or structural damage within the building. A watertight seal protects against unwanted water entry from rain, snow, or ground moisture, securing the integrity of the water service and the building's overall condition.

While sealing with insulation might seem beneficial in some contexts, it does not provide a complete barrier against water ingress. Covering the opening with mesh could allow moisture and pests to enter, while leaving the opening open for ventilation would compromise the building's water management and climate control. Therefore, achieving a watertight condition is essential for protecting the interior of the building from damaging water exposure.