Technical Booklet D Structure·Page 86·Diagram 4C.18
Wall thickness requirements for masonry with openings
Specifies minimum wall thicknesses and pier dimensions for masonry walls without openings, with single openings, and with multiple openings, including requirements for pier orientation based on opening width.
Wall thicknesses: 3.0 m maximum height. Minimum pier size (Ap x Bp) should be (390 mm x 190 mm) or (327 mm x 215 mm) depending on the size of the masonry units. Isolated columns (Case c) to be 325 mm x 325 mm minimum (Cc x Cc). Orientation of piers with opening width G not greater than 2.5 m. Orientation of piers with opening width G greater than 2.5 m. Cases shown: a) wall without a major opening, b) walls with a single major opening, c) wall with two major openings. Reference paragraphs 4C.45 and 4C.46.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet D - Structure.pdf