In which occupancy type are solid risers not required in stairways?

In certain occupancy types, building codes allow for exceptions regarding stairway construction requirements, including the use of solid risers. Group A (assembly), Group B (business), and Group R (residential) occupancy types are often granted flexibility in designing stairways to accommodate their specific use and traffic patterns.

In contrast, Group I-3 (institutional establishments that house individuals who may be incapable of self-preservation), Group F (factory and industrial), and Group H (high-hazard) typically have stricter requirements due to their operational nature and the potential risks involved. Solid risers can help in reducing the risk of accidents and improve safety in those environments.

Therefore, stating that solid risers are not required in stairways for occupancy types A through C reflects an understanding of the different safety needs and design flexibility allowed for less hazardous environments. This highlights a more lenient approach in regulations for these groups, promoting both functionality and safety appropriate to their usage.