Final answer:
The Ontario Building Code is updated approximately every five years to reflect new knowledge and advancements in the field. The amendments can also occur irregularly if needed.
Step-by-step explanation:
The Ontario Building Code is a regulatory document that provides the technical requirements for the design and construction of buildings in Ontario, Canada.
The code is reviewed and amended approximately every five years to update standards and to reflect new knowledge, changes in technology, and improvements in building science. However, it's important to note that amendments can also occur at irregular intervals in response to specific issues or advancements. The latest comprehensive review leading to amendments occurred in 2019, illustrating the pattern of ongoing updates aligning with technological and industry evolutions.