The long-anticipated Roofline Closure Systems have finally been launched, marking a significant milestone in the External Wall Insulation (EWI) industry. With the endorsement from DESNZ (the Department for Energy Security and Net Zero) and a supporting letter highlighting this development, these systems have been officially approved for PAS retrofit projects. This comes after three years of dedicated work by a cross-industry working group, ensuring a robust, cost-effective solution that meets the stringent demands of UK weather and building standards.

Roofline Closure Systems present a robust alternative to verge trims

Roofline Closure Systems offer a much-needed alternative to the problematic verge trims of the past. Unlike the old verge trims, which often resulted in water ingress and thermal bridging—especially in moisture-generating rooms like bedrooms and bathrooms—these new systems provide a more reliable method of protecting EWI systems without extending rooflines. This is particularly beneficial for properties where extending the roofline is not feasible.

It is essential to note that Roofline Closure Systems is not a reintroduction of verge trims but a completely new approach designed to address the shortcomings of previous methods. The durability and weather resistance are emphasised, ensuring that these systems can withstand the UK’s harshest conditions.

Process and importance of compliance

The introduction of Roofline Closure Systems includes a detailed process to ensure that every installation meets the required standards. This process begins with an initial site survey to assess the roofline’s condition and limitations. The system designer then uses the survey data to create a tailored solution that adheres to the updated Weathering Guide and Design Principles documents.

This rigorous approach is necessary to ensure the long-term effectiveness of the Roofline Closure Systems. The system designer, fabricator, and contractor must work closely to develop a design using the specified materials—namely, aluminium or stainless steel of a minimum grade and thickness, with a mandatory coating specification. Once the retrofit designer or coordinator approves the design, the installation can proceed, following strict guidelines and documenting each step.

Failure to follow the prescribed process could result in the installation being rejected, or worse, the removal of Roofline Closure Systems as a solution within the industry. This highlights the critical importance of adherence to the guidelines to protect homeowners and maintain the integrity of the EWI systems.

Solution for thousands of properties

The successful launch of Roofline Closure Systems is expected to provide a retrofit lifeline for tens of thousands of uninsulated solid wall properties across the UK. The flexibility of the design principles allows for customised solutions tailored to the specific needs of each project, making it possible to address the diverse range of roofline conditions encountered in retrofit projects.

However, it is crucial to understand that this is not a one-size-fits-all solution. The Design Principles must be strictly followed, and each project may require multiple solutions to achieve the desired results. The Weathering Guide has been updated to reflect this, providing essential guidance for designers, architects, and installers.

Training and support

To ensure successful implementation, training has been a key focus in the lead-up to the launch. Over 650 industry professionals participated in training sessions held by the working group. However, additional training can be arranged through SWIGA or the system designer for those who missed these sessions. We will be running compliance and competence sessions at EWI Pro Training Academy centres shortly,

As the industry adapts to these new systems, it is imperative that all stakeholders—whether part of the supply chain or potential end clients—fully understand the new processes and requirements. The supporting documents, available from SWIGA, IAA, INCA, NIA, Trustmark, or directly from the system designer, provide comprehensive guidance to ensure compliance and success in every project.

Various documents, including specifications and design principles, are available for download on the SWIGA website.