What is a wall that acts as a common support for structures on different properties called?

A wall that acts as a common support for structures on different properties is referred to as a party wall. This type of wall is typically built on or near the boundary line between two properties and is shared by both property owners. It serves the practical function of supporting the structures on both sides while also adhering to property line regulations.

The concept of a party wall is important in property law and maintenance regulations, as it impacts both the rights and responsibilities of the neighboring property owners. Each owner may have certain rights regarding its use and maintenance, and this designation helps clarify ownership and responsibility issues when it comes to repair, renovation, or rebuilding.

Understanding the role of a party wall is crucial for compliance with the International Property Maintenance Code, as it affects not only structural integrity but also fire safety and sound insulation for the adjoining properties. This is why the term "party wall" is the most accurate descriptor in this context.