Regulatory developments in Italy have placed a focus on fire safety in buildings, with particular attention to fire propagation in ventilated façades. The entry into force of RTV 13 (Vertical Technical Regulation No. 13) has redefined the design criteria for safe building envelopes, imposing rigorous standards to limit the likelihood of fire and subsequently extending this requirement to porcelain stoneware ventilated façades. This provision applies to both new construction and the renovation of façades of residential buildings with a fire safety height greater than 12 meters.
RTV 13 and building envelope: provisions for porcelain stoneware ventilated façades
The practical application of Vertical Technical Regulation 13 requires façade elements to ensure a specific façade reaction to fire: porcelain stoneware and all other components must meet specific performance requirements. The regulation aims to prevent the cavity of porcelain stoneware ventilated façades from acting as a chimney, accelerating the passage of flames and smoke. For this reason, RTV 13 requires a fire risk assessment of ventilated walls that considers every single element, from substructures to insulation.
The main safety parameters for ventilated envelope defined by RTV 13 include:
- The use of fireproof materials, such as porcelain stoneware for façades, to limit the fire load;
- The installation of strategically placed fire barriers on ventilated façades to interrupt the chimney effect;
- The choice of fastening systems for ventilated walls that maintain the structural integrity of the façades in the event of a fire;
- The use of non-combustible thermal insulation for ventilated walls, usually provided by rock wool insulation.
What are the main advantages of porcelain stoneware for façades in terms of fire reaction?
Porcelain stoneware for façades offers the highest level of passive protection because it is intrinsically non-combustible, classified as class A1 (or A1fl). Thanks to its extremely high-temperature production process, it does not contribute to the fire load, does not emit toxic fumes, and does not drip flames, ensuring excellent prevention of flame spread outdoors compared to plastic, composite, or HPL materials. These intrinsic characteristics of porcelain stoneware offer a certified safety guarantee, without the need for additional chemical treatments.
When designing a fire-resistance strategy for ventilated façades, relying on a partner specialized in ventilated façade systems like Imola Tecnica allows designers to streamline the process of complying with fire regulations for ventilated walls. Turnkey façade management ensures that every component, from external façade cladding to metal substructures for external cladding, meets the technical requirements for ventilated façades in stoneware as per RTV 13. This integrated approach eliminates inconsistencies between design and construction site, ensuring the fire safety of ventilated façades at every stage, including what is often the most challenging: reconciling freedom of expression with regulatory compliance. The use of stoneware façades preserves the project’s compositional and chromatic richness, while ensuring regulatory compliance and transforming fire safety from a constraint to an intrinsic value of the architecture.
How to choose non-combustible cladding to ensure the safety of ventilated façades in tall buildings?
For tall buildings, the choice of non-combustible façade cladding, such as Class A1 porcelain stoneware, must focus on building materials with the highest possible fire reaction certification. The risk of fire in multi-story buildings must be minimized by designing non-combustible RTV 13 ventilated façades. This means using components that do not promote the uncontrolled spread of smoke and heat in the cavity of ventilated façades: stoneware façades meet this requirement due to their intrinsically safe physical properties.
The advantages of using Class A1 external cladding materials in high-density buildings include:
- Durability of stoneware exterior cladding, which resists thermal shock without compromising stability;
- High passive fire protection in ventilated façades, reducing post-event maintenance costs;
- Optimization of ventilated façade design for hospitals and schools, where occupant safety is a priority;
- Full compliance with fire regulations, avoiding fines or the need for future upgrades.
The role of façade renovation in improving passive fire protection
Façade renovation represents the ideal opportunity to upgrade existing buildings to RTV 13 standards, creating non-combustible ventilated façades. Renovating older buildings often means replacing old, flammable cladding with non-combustible porcelain stoneware or other fireproof materials. Intervening on dated buildings often means replacing old flammable cladding with non-combustible porcelain stoneware façades or other fireproof materials.
Energy efficiency upgrade solutions include integrating non-combustible exterior cladding, such as Class A1 porcelain stoneware, which works in synergy with new thermal insulation systems. The fire behavior of ventilated façades thus upgraded is significantly improved, significantly reducing the rate of fire spread. The technical advantages of stoneware façade therefore extend beyond the surface, protecting the load-bearing structure and facilitating the intervention of emergency responders.
Integrated solutions for energy efficiency and fire safety in ventilated façades
The combination of energy efficiency and fire safety in ventilated façades is the cornerstone of modern construction. Designing ventilated façades in porcelain stoneware today means balancing thermal transmittance with the use of non-combustible components. The technical challenge is ensuring that the non-combustible façade coverings work properly with breathable membranes and joints, while maintaining fire safety as a top priority.
Imola Tecnica responds to these needs with specialized consulting that accompanies the client from façade renovation to new construction. The use of Class A1 porcelain stoneware for ventilated façades guarantees that the envelope passes the most stringent tests required by RTV 13. Thanks to a systemic approach, it is possible to create buildings that not only respect the environment through energy savings, but also offer certified and long-lasting fire safety in ventilated façades.
