R1003.1

Section R1003.1 is titled 'Definition' and covers requirements for masonry chimneys. An explanation of what this (main) section considers a masonry chimney and its function, and the way it is required to be built in accordance with this section's subsections is established. The purpose of this section is to prevent structural failure, smoke from entering the building, and the building from catching fire, as well as to slow the spread of fire.

The model shows a masonry fireplace and highlighted masonry chimney.