Which type of construction with exterior weight bearing walls has a 1-hour fire resistive rating?

Ordinary construction is characterized by exterior walls that are typically made of non-combustible materials, such as brick or concrete, and these walls provide a specific level of fire resistance. In many jurisdictions, ordinary construction elements have a fire-resistive rating of 1 hour. This rating is essential in terms of limiting the spread of fire from one building to another and providing occupants additional time to evacuate in the event of a fire.

Light frame construction involves primarily wood materials, which do not generally meet the same fire resistive standards as ordinary construction. Heavy timber construction also has distinct characteristics and is often exempt from certain fire rating requirements due to the mass of the wood used, while steel frame construction's fire resistance can vary and often requires additional fireproofing measures. Thus, ordinary construction stands out specifically for its established 1-hour fire resistive rating, making it the correct choice in this context.