What is the fire-resistance rating for an interior bearing wall only supporting a roof?

The fire-resistance rating for an interior bearing wall that is only supporting a roof is indeed established as 2 hours. This requirement is detailed in building codes which focus on the structural integrity and safety of buildings in the event of a fire.

Interior bearing walls play a crucial role in supporting the weight of the roof and possibly additional levels above them. Given that they are primary structural elements, they require a higher fire-resistance rating to ensure that they can withstand the effects of fire for a sufficient period, allowing occupants enough time to evacuate and firefighters to control the situation.

In many building codes, the requirement for fire-resistive construction is determined not just by the location of a wall but also by its function and the type of construction. While other walls might have different ratings, the specific classification for a bearing wall solely supporting a roof has settled on the 2-hour benchmark to provide adequate time for safety measures in the event of a fire emergency.