What type of construction is typically most fire-resistant?

The most fire-resistant type of construction is typically steel frame. Steel has a high melting point and does not combust like other materials. In fire situations, steel structures can maintain their integrity longer than wood or masonry, especially when properly protected with fireproofing materials. Steel framing is often used in commercial buildings specifically because of its durability and ability to withstand intense heat without losing structural strength.

When considering other types of construction, wood frame structures are particularly vulnerable to fire due to their combustible nature. Masonry, while more fire-resistant than wood, can still crack and fail under intense heat, as well as allow potential heat transfer through joints. Log construction, which involves solid wood logs, also has significant fire risk due to its combustible elements. Thus, steel frame construction stands out as the superior choice for fire resistance among these options.