What is the correct classification standard for roof terraces?
When referring to a roof terrace, we need to use a different classification standard: EN13501-5. Part 5 of EN13501; the 'Classification using data from external fire exposure to roof tests'. Part 5 classifies the roof build-up based on the level of fire penetration through the roof system rather than its level of combustibility.
The fire classification with an 'un-restricted' application for roof terraces is BRoof(t4). BRoof(t4) is an entire system test, so everything from the structural slab; through to the top surface; should be tested together. BRoof(t4) tests the whole system, so when an element of the roof build-up changes, there may be a need for a new certificate to cover that particular scenario. If an EXAP (extended application) report is published, it can cover certain variables within the roof build-up.
BRoof(t4) can be achieved for a roof build-up even when combustible elements are present, such as the waterproofing membrane, insulation, plastic pedestals etc. We also have the European Commission Decisions that can help us achieve BRoof(t4) without the need for testing.