Building codes typically allow how many floors to be open to the atrium?

The correct choice reflects common building code practices regarding atriums. In many jurisdictions, building codes allow for an atrium to feature openings that include multiple floors to enhance natural light and promote a spacious environment within the structure. Typically, building codes permit up to three levels to be open to the atrium. This arrangement supports fire and life safety considerations while still allowing architects and builders the flexibility to create visually appealing open spaces.

Regulations often aim to balance safety, ventilation, and fire control, especially considering how fires may spread through an atrium's vertical openings. Therefore, a limit of three open levels strikes a reasonable compromise between aesthetic appeal and safety protocols established by building codes.