What term describes lumber with minimum dimensions of 8 inches?

The term that describes lumber with minimum dimensions of 8 inches is Heavy Timber. This classification is recognized in building codes and fire safety regulations because of the fire-resistant properties inherent in thicker pieces of wood. Heavy Timber structures can withstand fire for a longer duration due to the larger cross-sectional area, which means they can maintain structural integrity even in adverse conditions.

The 8-inch minimum dimension is significant as it allows the timber to char on the outside during a fire, creating a protective layer that insulates the inner wood and slows the combustion process. This characteristic is particularly important in designing buildings that prioritize safety and protection against fire hazards.

In contrast, Standard Timber typically refers to lumber dimensions that do not meet the criteria for Heavy Timber, while Light Timber involves smaller dimensions that do not provide the same level of fire resistance. Laminated Timber, on the other hand, consists of layers of wood glued together, which does not directly correlate with the dimensional criteria established for Heavy Timber.