Retrofitting (or recladding)
a deep dive:
As cities evolve and architectural standards advance, older buildings often find themselves struggling to meet the demands of contemporary design, sustainability, and performance criteria. Retrofitting (or ‘recladding’) existing structures with rainscreen cladding façades presents a transformative solution, offering a way to enhance both the aesthetic appeal and functional performance of older buildings.
For example, 2200m2 Optima TFC+ 3.0mm in Aluminium Luxe Coat was used in the reclad of the Christina Miller Building and the Alexander Graham Bell Building (below) to provide an A1 rated finish.
In this article, we’ll explore the concept of rainscreen cladding façade retrofitting and its potential to upgrade older buildings for modern performance and aesthetic appeal.
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Recladding for fire safety and building performance
Whilst recladding has historically been used to update the external façade of a building for aesthetic reasons, in more recent years recladding has been required to ensure the materials used in the building are fire safe and compliant.
The ICOSS building in Sheffield, for example, has recently undergone a recladding project to meet updated building requirements. The previous cladding was removed, and new, non-combustible anodised aluminium panels were installed.
Additionally, cladding systems are required to undergo rigorous fire testing, such as the BS8414 test, to demonstrate their resistance to the spread of fire. Systems that meet these requirements are classified under BR135 for their suitability in high-rise and sensitive building applications. Upgrading building materials through recladding ensures not only compliance but also the safety of building occupants by significantly reducing fire risks.
With over 40 years of experience, Sotech has been at the forefront of developing non-combustible, fire-safe products rigorously tested to the highest standards. Our Optima range includes true A1 and A2-rated materials such as PPC Aluminium, Anodised Aluminium, and Zinc, ensuring compliance with the latest fire safety regulations.
Understanding Rainscreen FaCade Retrofitting:
Rainscreen façade retrofitting involves the installation of a new cladding system on the existing building. The new systems might sit on top of the existing exterior envelope of a building, in the case of brick and cement, for example. Where an existing rainscreen solutions is in situ, this is often dismantled and a new rainscreen solution is put in its place. This is particularly relevant when fire safety requirements are not being met by the existing Building Regulations.
Recladding projects are also often undertaken for aesthetic reasons, to address durability issues, or to improve energy efficiency.
3,500/m2 of Aluminium J57S Grade Anodised in United Anodisers Regency Gold 3 was used in the reclad of Glasgow’s Queen Street Station, for example, as part of a larger scale regeneration project for the station.
Understanding the RETROFITTING Process:
The process of rainscreen façade retrofitting typically begins with a comprehensive assessment of the existing building envelope to identify any structural weaknesses, moisture issues, or aesthetic concerns. Once the condition assessment is complete, architects and engineers collaborate to select the most suitable rainscreen system to meet the specific needs and constraints of the project.
This involves selecting appropriate cladding materials, detailing attachment methods, and specifying insulation and ventilation components.
With the design finalised, skilled contractors and installers execute the retrofitting process, which typically involves removing existing cladding materials, preparing the substrate, installing the rainscreen framework, and affixing the new cladding panels or components.
Finally, regular maintenance and monitoring are essential to preserve the longevity and effectiveness of the rainscreen system over time.
Through careful planning, expert design, and meticulous execution, recladding an existing building can successfully rejuvenate older buildings, improving their performance and aesthetics for decades to come.
Benefits of Rainscreen Facade Retrofitting:
Enhanced Building Performance: Recladding provides an effective way to bring buildings up to the current fire safety standards required in the UK. For example, the the Building Regulations (Approved Document B), mandate that materials used in external wall systems for high-rise buildings over 18 metres must be non-combustible. This is typically achieved with materials rated A1 or A2-s1,d0 under the European Fire Classification system (Euroclass).
Enhanced Weather Resistance: Rainscreen façades offer superior protection against moisture infiltration, preventing water from penetrating the building envelope and causing damage to structural components, insulation, and finishes. By effectively managing moisture, rainscreen retrofitting can mitigate the risk of mould growth, rot, and deterioration, prolonging the lifespan of the building.
Improved Thermal Performance: Retrofitting older buildings with rainscreen façades can significantly enhance thermal insulation and energy efficiency. The air gap between the cladding and the original façade or building envelope acts as a thermal buffer, reducing heat transfer and minimising thermal bridging. This results in reduced heating and cooling loads, lower energy consumption, and improved indoor comfort for occupants.
Aesthetic Transformation: Rainscreen façades offer endless possibilities for aesthetic customisation, allowing building owners to refresh the appearance of older structures and adapt them to contemporary design trends. With a wide range of materials, colours, textures, and finishes available, rainscreen retrofitting can breathe new life into outdated façades, revitalising streetscapes and enhancing property values.
Structural Reinforcement: In addition to aesthetic and performance improvements, recladding can provide structural reinforcement to older buildings, strengthening their resilience against seismic activity, wind loads, and other environmental stresses. By distributing loads more evenly and reducing the strain on the original building envelope, rainscreens can help extend the lifespan of the structure and enhance its durability.
Considerations for Rainscreen Facade Retrofitting:
While the benefits of rainscreen façade recladding are clear, it’s essential to approach the process thoughtfully and systematically. Consider the following factors when planning a retrofit project:
Building Condition Assessment: Conduct a thorough evaluation of the existing building envelope, including structural integrity, moisture infiltration, insulation levels, and cladding condition. Identify any deficiencies or areas of concern that may need to be addressed during the retrofitting process.
Material Selection: Choose appropriate cladding materials and systems based on factors such as durability, compatibility with the existing structure, design aesthetics, and budget constraints. Consider sustainable options that offer long-term performance benefits and contribute to energy efficiency. Speak to an expert with experience in reclad projects, such as Sotech’s team of in house experts.
Installation Methodology: Work with experienced professionals and contractors who specialise in rainscreen façade retrofitting to ensure proper installation and integration with the existing building envelope. Follow industry best practices and local building codes to ensure compliance and mitigate risks.
Maintenance and Lifecycle Considerations: Develop a comprehensive maintenance plan for the rainscreen cladding façade to preserve its appearance and performance over time. Regular inspections, cleaning, and repairs are essential to prevent issues such as moisture infiltration, corrosion, and deterioration.
Conclusion
Rainscreen façade retrofitting presents a compelling opportunity to upgrade older buildings for modern performance, transforming their appearance, functionality, and sustainability. By incorporating rainscreen systems into retrofit projects, building owners can enhance weather resistance, improve thermal performance, rejuvenate aesthetics, and strengthen structural integrity. With careful planning, thoughtful design, and expert execution, rainscreen façade retrofitting can breathe new life into aging buildings, ensuring their relevance and viability for years to come.
With over 40 years of experience, Sotech has been at the forefront of developing non-combustible, fire-safe products rigorously tested to the highest standards. Our Optima range includes true A1 and A2-rated materials such as PPC Aluminium, Anodised Aluminium, and Zinc, ensuring compliance with the latest fire safety regulations.
To speak to Sotech about a recladd project for safety or aesthetic reasons, speak to a member of our team here >>
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