According to PD 1095, a dry standpipe is required for buildings that are how many stories or more?

The requirement for a dry standpipe in buildings that are four stories or more is rooted in fire safety regulations as outlined in PD 1095. A dry standpipe system is crucial for firefighting efforts, particularly in taller buildings where standard hose connections may not adequately reach all floors.

As buildings increase in height, the risks associated with fires also escalate due to factors such as longer vertical travel for smoke and heat, increased difficulty for firefighters to gain access to upper levels, and the potential for fire to spread quickly beyond the reach of ground-level hoses.

Implementing a dry standpipe system in buildings of four or more stories ensures that firefighters have immediate access to water at elevated levels. This system is installed within the building and can be accessed from different floors, allowing for more effective fire suppression in emergencies. Thus, recognizing the physical and logistical demands of firefighting in taller structures, the specifications in PD 1095 clearly establish the necessity of dry standpipes for buildings starting at four stories and above.