According to the standards, what must the construction of masonry heaters comply with?

The construction of masonry heaters must comply with the International Building Code (IBC) and the International Residential Code (IRC). These codes are comprehensive standards that provide guidelines for the safe design, construction, and maintenance of buildings and structures, which include masonry heaters.

The IBC covers a wide range of building practices for different types of construction, including commercial and residential buildings, ensuring that structures are safe for occupancy and use. The IRC specifically addresses house-related construction and would include standards pertinent to residential heating systems like masonry heaters. Compliance with these codes ensures that the construction methods used will meet safety and performance requirements, thus protecting occupants from various hazards such as fire and structural instabilities.

While local building codes, the Commercial Building Code, and the National Fire Code may also have relevant provisions or requirements, the primary references for masonry heater construction are specifically found in the IBC and IRC, making that choice the most appropriate.