BROOF Roof Systems: Regulations and Roof Design

The BROOF classification identifies the external fire performance of a roof system subjected to specific fire tests.

The reference standard is EN 13501-5, while the test methods are defined by CEN/TS 1187.

These tests simulate different external fire exposure conditions and assess:

• flame spread;
• fire penetration;
• the occurrence of burning droplets or debris;
• the behaviour of the complete roof build-up.

It is important to emphasise that the BROOF classification does not apply to an individual material, but to the complete roof system in its tested configuration, including:

• structural substrate;
• thermal insulation;
• waterproofing membranes;
• fixing systems;
• any installations or components present on the roof.

The designations t1, t2, t3 and t4 do not indicate increasing levels of performance or quality, but refer to different test methods defined by CEN/TS 1187.

BROOF Classification: Overview

The BROOF classification represents the highest performance class for external fire performance of roofs under the applicable test method. The designation in brackets – (t1), (t2), (t3) or (t4) – identifies the specific test method used and should therefore always be stated together with the BROOF classification.

Attention to roof fire safety has increased significantly with the growing use of:

• photovoltaic systems;
• lightweight industrial roofing systems;
• synthetic waterproofing membranes;
• high-performance insulation systems.

Where technical installations or combustible materials are present, the roof can become a critical element in the spread of fire. A roof system classified as BROOF, on the other hand, can help to:

• limit the spread of flames;
• improve overall building safety;
• protect people and structures;
• reduce the risk associated with external fire exposure;
• support compliance with applicable fire safety requirements.

The growing use of photovoltaic systems has further increased attention to the fire performance of roof systems. Recent guidelines issued by the Italian Fire and Rescue Service emphasise that fire safety must be assessed by considering:

• the complete roof build-up;
• fixing systems;
• installations and equipment present on the roof;
• the continuity of materials within the roofing system.

In particular, the BROOF classification plays a key role in:

• warm roof systems;
• industrial roofing systems;
• metal deck roofs;
• roofs incorporating photovoltaic systems.

Today, roof design must simultaneously address:

• fire safety;
• thermal insulation;
• energy efficiency;
• waterproofing;
• long-term durability of the roof build-up.

For this reason, modern roofing solutions require an integrated design approach capable of delivering both high energy performance and compliance with applicable fire safety regulations.

The increasing complexity of modern roof systems makes it essential to select properly designed and certified solutions. Today, designers, contractors and construction professionals must address:

• increasingly advanced fire safety regulations;
• demanding energy performance requirements;
• the growing presence of photovoltaic systems;
• the need to ensure long-term roof durability.

BROOF classifications therefore represent an important reference for ensuring fire safety, regulatory compliance and long-term reliability.

An Advanced Approach to Roof Fire Safety

Roof fire safety can no longer be considered a secondary aspect of building design. Evolving regulations and the increasing presence of technical installations on roofs require systems designed to provide:

• control of fire spread;
• protection of the building;
• safety of occupants;
• durability of the roof build-up;
• consistent performance over time.

In this context, BROOF-classified roof systems represent an advanced technical solution for addressing the evolving safety and performance requirements of modern buildings.