Which of the following is NOT a common material for balcony columns?

The choice of materials used for balcony columns is important in ensuring structural integrity and meeting aesthetic requirements. Steel is indeed a common material used for balcony columns due to its strength and durability. It can support significant loads and can be fabricated to various designs, making it popular in modern construction.

Wood posts and manufactured hollow wood columns are also common options, often chosen for their appealing appearance and the ability to blend with traditional architectural styles. Boxed columns are another prevalent material; they consist of solid or composite wood and are often used for their structural support and decorative characteristics.

Thus, while steel is a widely accepted material in construction, the question focuses on identifying a material that is less common in balcony column construction. Since steel is frequently used due to its beneficial properties, it cannot be considered as the correct answer for the option that is NOT commonly used for balcony columns.