Type IV Heavy Timber construction is rarely found today primarily due to what?

Type IV Heavy Timber construction, which emphasizes the use of heavy timber framing, is indeed less common today largely because of building code restrictions. These codes have evolved over time to prioritize safety and efficiency in construction practices, particularly in urban areas or places with higher population density. Many jurisdictions have adopted more stringent regulations that either limit or specify the conditions under which heavy timber construction can be used, often favoring materials and methods that are deemed to provide a higher level of fire resistance or structural integrity.

The focus on fire safety is particularly significant in light of past incidents where heavy timber structures posed significant risks. As fire codes became more comprehensive, they began to limit the use of heavy timber in favor of alternative construction types that offer better fire protection measures. Hence, although heavy timber has its benefits, such as aesthetic appeal and the sustainability of using natural materials, the increasing focus on safety is a key reason for its decline in prevalence in contemporary construction.