What characteristic is typical of Type 1 construction?

In Type 1 construction, which is often referred to as "fire-resistive" construction, a key characteristic is that the roofs are extremely difficult to penetrate. This type of construction is primarily made of non-combustible materials, usually concrete and steel, which are designed to withstand high temperatures and resist fire for an extended period. The difficulty in penetrating roofs in this construction type is attributed to the heavy, durable materials used, making it challenging for fire personnel to access the space above ceilings or within roof structures during firefighting operations.

This fire-resistant nature is critical since it helps to prevent the spread of fire and provides greater safety for occupants and firefighters. Understanding this characteristic of Type 1 construction is essential for effective fire response, as it informs strategies for accessing potentially hidden fire and identifies potential risks in firefighting operations.