What is the maximum size of stone for stone masonry?

The maximum size of stone for stone masonry is generally recognized as around 150 mm. This size is practical for ensuring that the stones can be easily handled, transported, and placed accurately in a masonry structure. Larger stones can be cumbersome and challenging to work with, which can lead to difficulties in aligning, leveling, and achieving the desired strength and stability of the masonry.

In addition, the use of stones that are too large could create uneven load distribution, leading to potential structural issues. The 150 mm size strikes a balance between providing sufficient mass for load-bearing while still allowing for effective craftsmanship and durability in the masonry. Smaller stones can sometimes be used depending on the specific application and design required, but 150 mm is a widely accepted standard for ensuring optimal performance and safety in stone masonry.