Minimum thickness for foundation walls made of rough or random rubble stone?

The minimum thickness for foundation walls made of rough or random rubble stone is established to ensure structural integrity, durability, and resistance to various environmental factors. A thickness of 16 inches is deemed appropriate because thicker walls provide better load-bearing capacity, resistance to lateral forces such as soil pressure, and improved moisture management, which is particularly critical in foundations that are below grade.

Thinner walls may not adequately fulfill these purposes, potentially leading to structural issues over time. Furthermore, a thickness of 16 inches allows for the natural variations in stone sizing and placement often characteristic of rubble stone construction, ensuring that the wall can effectively distribute loads while accommodating the material's inherent characteristics. This standard reflects best practices in building to ensure longevity and safety in structural designs, particularly in climates where frost and water penetration could pose risks to foundation stability.