What is required for encapsulated mass timber structures according to the new code?

The requirement for fire resistance ratings in encapsulated mass timber structures is based on the need to ensure safety against fire hazards and to protect the structural integrity of the building. Fire resistance ratings define how long a material or assembly can withstand fire exposure while maintaining its functionality and stability.

In the context of encapsulated mass timber, which is a construction method where the timber elements are protected by a non-combustible material, it is essential to establish these fire resistance ratings to achieve compliance with safety standards outlined in the building code. This ensures that, during a fire event, the structure will perform safely and provide adequate time for occupants to evacuate.

Concrete underpinning, steel reinforcements, and timber cladding, while potentially significant in certain construction methods or materials, do not directly address the critical aspect of fire safety that encapsulated mass timber structures require. The emphasis on fire resistance ratings underscores the code's focus on preventing material failure and preserving life safety in the event of a fire.