What is the fire resistance rating of the interior walls of Type IV construction according to PD 1096?

In Type IV construction, which is also known as "Heavy Timber" construction, the fire resistance rating of interior walls is specified as 2 hours according to PD 1096. This building type typically utilizes substantial wooden materials, which can provide a certain level of fire resistance due to their mass. The 2-hour rating is significant as it is designed to ensure that interior walls can withstand fire exposure for a sufficient duration, helping to prevent the spread of fire within the building and allowing for safe evacuation. This standard reflects an understanding of fire dynamics and the necessity of protecting occupants and property in the case of fire emergencies.