CEN/TR 18326:2026 / Classificazione resistenza al fuoco sistemi di copertura con moduli fotovoltaici installati sopra il tetto

CEN/TR 18326:2026 / Classificazione resistenza al fuoco sistemi di copertura con moduli fotovoltaici installati sopra il tetto

ID 26471 | 16 Giugno 2026 / Preview (EN) in allegato

CEN/TR 18326:2026
Rapporto sugli scenari di installazione, i metodi di prova disponibili e la legislazione nazionale da considerare per la classificazione della resistenza al fuoco dei sistemi di copertura con moduli fotovoltaici installati sopra il tetto.

Questo documento esamina gli scenari di installazione, i metodi di prova disponibili e le normative nazionali da considerare per determinare la resistenza al fuoco dei tetti con impianti fotovoltaici installati sopra il tetto.

Il rapporto analizza inoltre i partner e le autorizzazioni attualmente in essere per la pianificazione, l'installazione e la gestione/manutenzione degli impianti fotovoltaici installati sopra il tetto, nonché le relative responsabilità.
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CEN/TR 18326:2026
Report on installation scenarios, available test methods and national legislation to be considered for the fire performance classification of roof systems with above roof mounted PV modules

Introduction

Photovoltaic systems (PV) on roofs can be part of the roofing system (Building Integrated PV systems, BIPV) or mounted on top of a roof (Building Attached PV, BAPV). Above roof mounted PV systems are increasingly used. In most European countries the fire performance of roof integrated PV systems (BIPV) is tested in the same way as for roof systems. Whilst additional guidance is required in CEN/TS 1187 to ensure a unified approach to testing BIPV systems, this is not the subject of this TR, which addresses only BAPV systems.

Above roof PV modules (BAPV) are usually not considered as construction products. Therefore no harmonized standards until now have been developed by CEN for assessing the fire performance of these installations alone or in combination with the roofing system below.

PV modules in general are regulated under the low voltage directive (LVD 2014/35/EU)014/35/EU). It covers health and safety risks for electrical equipment, in order to make sure that the requirements are the same across Europe for products placed on the market. The European Committee for Electrotechnical Standardization (CENELEC) is responsible for standardization in electro-technical engineering field.

Statistics show an increased risk of fire on roofs with BAPV or BIPV. A major cause is with the electrical connections and these have been mitigated by adhering to CENELEC standards. Nevertheless, risks remain and PV installations can lead to the outbreak of fire and can contribute to the spread of fire on and within the roof.

A general assessment of all scenarios for BAPV mounting and fixing above roof systems procedures is needed.

This document addresses the fire performance of roofs fitted with BAPV modules. It considers the performance of the PV panels themselves, their method of mounting and the roof system they are mounted above. There are many variables and for the mounting system these include material, design, inclination and spacing between the PV modules and the roof covering.

Consideration is needed with regards with creation of Exap Rules due to the complex nature and number of variations within the construction.

1 Scope

This document describes installation scenarios and available test methods and national legislations to be considered when determining the external fire performance of roof systems, when combined with BAPV.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

EN ISO 13943:2017, Fire safety - Vocabulary (ISO 13943:2017)

3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN ISO 13943:2017 and the following apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:
- ISO Online browsing platform: available at https://www.iso.org/obp/
- IEC Electropedia: available at https://www.electropedia.org/

3.1
PV modules
PV Array
mechanically integrated assembly of modules or panels and its support structure

3.2
external fire performance
fire performance in case of external fire exposure

3.3
fire performance
response of a material, product or assembly in a fire
Note 1 to entry: It is often important to understand how materials, products or assemblies behave in real fires as opposed to in fire tests under controlled conditions. Improved fire performance can be exhibited in a variety of ways. For example, longer times to ignition, lower heat release, lower flame spread or lower smoke release could all be evidence of improvements in fire performance.
[SOURCE: Fire Vocabulary]

3.4
pitched roof
roof with an inclination angle of at least 10°

3.5
flat roof
roof with an inclination less than 10°

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Resistenza al fuoco: quadro normativo