2109.5.3 Rubble Stone Walls

The minimum thickness of rough or random or coursed rubble stone walls shall be 16 inches (406 mm) ...

of residence buildings-In residence buildings not more than three stories high, bearing walls other than coursed or rough or random rubble stone, may be 8 ...

equivalent to at least sixteen percent of the face area of the walls. (8.4.5.4). §C26-436.0 Rubble Stone Masonry.-The wall thickness of rubble stone ...

of masonry units or mortars of which the wall is composed. 5.2.7 Rubble stone masonry-In lieu of structural analysis, rubble stone masonry walls may ...

as required for brick chimneys. Rubble-stone chimney walls shall be at least twelve inches thick. (11.3.8.6). g. Extension of Chimneys Above Roof ...