What is the minimum thickness for a rubble stone foundation?

The minimum thickness for a rubble stone foundation is recognized as 16 inches. This thickness is established to ensure adequate support and stability for the structures built atop these foundations. A rubble stone foundation, made up of irregularly shaped stones, requires a considerable thickness to effectively distribute the load from the building above. The 16-inch thickness provides a balance between structural integrity and material use, addressing factors such as drainage, frost depth, and the potential for settling. Overall, adhering to this minimum thickness helps ensure that the foundation performs well, resisting shifting or movement over time, which is critical to the longevity and safety of the building.

Other thickness options may not meet the requirements for providing sufficient support, while an option that is too thick could unnecessarily increase the amount of material and cost without adding significant value. Thus, 16 inches is the standard that has been established as appropriate for rubble stone foundations in residential construction.