What is the required separation between Group M and Group R occupancies if the building is equipped with a sprinkler system?

When determining the required separation between Group M (Mercantile) and Group R (Residential) occupancies in a building equipped with a sprinkler system, the code typically allows for a reduced separation distance. In many building codes, if a building is fully sprinklered, the fire-resistance rating for separation can be reduced to one hour. This is based on the premise that sprinklers significantly mitigate fire risk and can contain a fire more effectively, thereby providing adequate safety and protection for occupants and properties.

The option specifying one hour of separation is aligned with the expected standards set by safety codes, which recognize that the presence of a sprinkler system helps manage fire safety and reduces the intensity and spread of potential fires. Thus, when a building with Group M and Group R occupancies is equipped with this fire suppression feature, it is sufficient to maintain a one-hour separation to ensure safety and compliance with the required fire resistance measures.