In heavy timber construction, what is the minimum thickness required for columns?

In heavy timber construction, a column thickness of 8 inches is the minimum requirement to ensure structural integrity and fire resistance. Heavy timber is characterized by the use of heavy structural members, typically made from solid wood, which can provide not only strength but also a degree of fire resistance due to the depth of the material.

Timber with a minimum thickness of 8 inches is significant because it can assist in charring, where the outer layer of wood protects the inner core during a fire. This charring process can slow down the rate at which heat penetrates the column, thereby maintaining its structural strength for a longer period in a fire situation.

Columns thinner than this may not provide the same level of security against fire or structural failure, hence the requirement for a minimum thickness is set at 8 inches in heavy timber construction codes and standards. This ensures that the building can withstand the stresses imposed by both the structural loads and potential fire exposure.