FOTOVOLTAICO vs VVF

  • The UNI 9177 standard is currently in force (Annex C to note prot. 6334 of 4-5-2012 of the Ministry of the Interior). This defines the fire resistance and reaction tests for the materials making up photovoltaic modules, based on specific safety standards. Following these tests, the materials are divided into classes that guarantee the modules' compliance. It is important to emphasize that only in Italy does a regulation of this type exist that identifies the fire resistance classes of photovoltaic modules, which belong to classes 1 and 2. The materials are assigned to the following classes (each demonstrating a different fire behavior): 0: non-combustible materials 1: non-flammable combustible materials 2: combustible materials that are difficult to ignite. The value increases as the materials' participation in combustion varies. This implies that the lower the class, the better a combustible material's fire behavior. If it is intended to take into account the external fire resistance class of roofs and roof coverings and the fire reaction class of the photovoltaic module (case 3/a of Annex B), the following combinations can be considered, in general, acceptable:
  • roofs classified as Froof and PV panel of class 1 or equivalent fire reaction;
  • roofs classified as Broof (T2, T3, T4) PV panel of class 2 or equivalent fire reaction, top layers of roofing (waterproofing and/or insulation packages) classified as Froof or F installed on EI 30 roofs and PV panel of class 2 or equivalent fire reaction.

    • Con il Decreto-Legge 23 settembre 2022 n. 144 (GU n.223 del 23.09.2022), all'Art. 16 Procedure di prevenzione incendi, è stabilito che, a seguito dell'emergenza energetica in atto, al fine di agevolare l’installazione di impianti fotovoltaici e solari termici sulle coperture e sulle facciate di edifici a servizio di attività soggette ai controlli di prevenzione incendi per la pronuncia sulla valutazione documentazione completa progetto, se necessaria dopo l’installazione, i termini sono ridotti da 60 a 30 giorni fino al 31 dicembre 2024.

    Gli impianti fotovoltaici non rientrano fra le attività soggette ai controlli di prevenzione incendi ai sensi del D.P.R. n. 151 del 1 agosto 2011 "Regolamento recante semplificazione della disciplina dei procedimenti relativi alla prevenzione incendi, a norma dell'articolo 49 comma 4-quater, decreto-legge 31 maggio 2010, n. 78, convertito con modificazioni, dalla legge 30 luglio 2010, n. 122".

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    MODULO: Installazione impianti fotovoltaici

    Installazione impianti fotovoltaici (da 07/02/2012)

    in attività soggette al DPR151

    SCIA con dichiarazione di non aggravio

    BORDER LINE SITUATIONS - WHERE TO INSTALL AN EI30 LAYER

  • Ventilated roofs employ advanced roof insulation technology and are primarily used for the construction of habitable attics. They consist of a panel of insulating material made of closed-cell sintered expanded polystyrene (EPS). They are self-extinguishing, non-toxic, hygienic, and durable. They are shaped with protruding supports to create ventilation channels and are bonded to a sheet of cross-laminated long-fiber phenolic plywood (OSB/3). The OSB/3 sheet is pre-treated with anti-mold, anti-woodworm, and water-repellent resins. It is highly resistant to compression, walkable during installation, and impervious to the weight of commonly used roofing materials (terracotta tiles, concrete tiles, Canadian shingles, etc.). The special shaping of the insulation panel allows for the creation of a ventilation chamber between the insulation and the phenolic wood, which serves as a support for the roofing. The constant and consistent circulation of air created within the panel removes heat from the roof covering, protecting the underlying layers from overheating. This ventilation increases and strengthens the insulation's properties by expelling heat from the roof ridge, thus reducing the temperature in the rooms below by 8-10°C. In addition to the risk assessment, which must be conducted "taking into account the external fire resistance class of the roofs and roof coverings and the fire reaction class of the photovoltaic module," other assessments aimed at demonstrating achievement of the guide's objectives are admissible. If the external fire resistance class of roofs and roof coverings and the fire reaction class of the photovoltaic module are to be taken into account (case 3/a of Annex B), the following combinations can generally be considered acceptable:
  • roofs classified as Froof and PV panel of class 1 or equivalent fire reaction;
  • roofs classified as Broof (T2, T3, T4) and PV panel of class 2 or equivalent fire reaction;
  • top covering layers (waterproofing and/or insulation packages) classified as Froof or F installed on EI 30 roofs and PV panel of class 2 or equivalent fire reaction. The classification of roofs and roof coverings must refer to the applicable conformity attestation procedures (CE marking) or, in their absence, the manufacturer's declaration based on a test report issued by an Italian laboratory authorized pursuant to the Ministry of the Interior Decree of 26 March 1985, or another laboratory recognized in one of the European Union countries or countries party to the EEA Agreement. For the purposes of assessing the external fire resistance class of roofs and roof coverings, please note that the first version of UNI CEN /TS 1187 was published in February 2012, replacing UNI ENV 1187:2007 cited in the technical guide. For information purposes, please note that European Commission Decisions 2001/671/EC (OJ L 235 of 4 September 2001) and 2005/823/EC (OJ L 307 of 25 November 2005) report the classification system for the external fire resistance of roofs and roof coverings. For the purposes of assessing the reaction-to-fire class of photovoltaic panels, please note that a specific resolution was issued on 28 March 2012 by Area V of the DCPST - Fire Reaction Sector, regarding the methods for carrying out reaction-to-fire tests on PV panels (Annex C). The resolution requires laboratories to issue a specific test certificate indicating the use "PHOTOVOLTAIC PANEL". The test certificate is related to the panel itself and not to the place of use. Risk assessments must be signed by qualified technicians registered in the Ministry of the Interior's registers.

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    La verifica dell'installazione di un pannello EI 30 sotto i pannelli fotovoltaici su una copertura con stratigrafia: