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Ask The A. Proctor Group Continued from page 64 How to prevent thermal bridging A popular measure of tackling thermal bridging and improving energy efficiency in buildings is installing insulation. Improving the insulation of a building is an example of a fabric-first approach to building design. In fabric first construction, the building elements are designed to reduce the reliance on external systems, such as mechanical or electrical heating or cooling systems. A fabricfirst approach will maximise both airtightness and insulation. The move to increase the insulation of buildings is not without its challenges, particularly in those areas which are difficult to insulate, e.g. existing buildings, solid wall buildings, window reveals, doorways and openings. However, the use of high-performance Spacetherm insulation can help overcome this. The Spacetherm insulation range comprises highperformance aerogel insulation that can be bonded to various boards to suit specific applications. On its own, Spacetherm Blanket is a versatile material that is both vapour permeable and hydrophobic, making it ideal for solid wall insulation. It can be bonded to a magnesium oxide board to produce Spacetherm Multi. This can be as thin as 16mm, including 10mm of insulation and a 6mm board, making it ideal for breaking the cold bridges typically found at window reveals. Also, as it’s available in greater depths, it allows walls to be insulated to a thinner depth than would otherwise be possible. For example, 45-50mm of Spacetherm insulation would bring a typical wall down to the 0.3 W/m²K required for building regulations and EnerPHit certification. In addition, Spacetherm (CBS) cold bridge strips can easily be applied to minimise cold bridges. The cold bridge strips consist of Spacetherm Aerogel insulation encapsulated in polyethelene. Spacetherm CBS is an ideal choice for timber or steel frame structures and can be cut to various widths to suit different applications. Addressing the challenge of internal insulation, Spacetherm Wall Liner is a thin thermal laminate Above: The introduction of Spacetherm Multi insulation significantly improved the heat efficiency of this Grade II listed Georgian townhouse in the historic city of Bath, which was built in 1818. of about the thickness of a standard layer of plasterboard. It consists of 10mm of Spacetherm insulation and a 3mm Magnesium Oxide board adhered to the wall to provide significant thermal retention compared to the uninsulated wall. Typically, it would bring a solid stone wall (with a starting U-value of around 2.3 W/m²K) down to a U-value of between 0.7 and 0.9, representing a noticeable drop in energy lost through the wall. Façade retention projects Another area where we encounter the challenge of cold bridging is façade retention projects. Often in these projects most of the building is demolished and replaced with a modern new-build structure, retaining only the facade of the existing structure. Air leakage and cold bridging are the most significant problems to be overcome, so by combining a vapour-permeable, self-adhering air barrier membrane with a layer of highperformance insulation, Wraptherm offers an ideal solution to address these. Wraptherm is installed on the reverse of the retained facade stonework. However, as Wraptherm is vapour-permeable, it does not adversely affect moisture movement through the facade stonework. This helps limit the damage that can occur when moisture flow through older stonework is altered by refurbishment works. As well as protecting the existing building fabric, Wraptherm’s hydrophobic properties provide a secondary barrier to water ingress, sealing tightly to door and window frames and other penetrations and limiting heat loss associated with air leakage. The unique layer of aerogel insulation in the Wraptherm also effectively limits cold bridging by providing a continuous insulation layer across the back of the facade. Hence, there is a thermal break between the new structure internally and the cold outer stonework, further boosting the energy performance of the upgraded building. Combining these properties into a single material, Wraptherm speeds up and simplifies the installation process and reduces on-site defects and requirements for costly remediation. It is crucial that contractors understand the importance of preventing and reducing the occurrence of cold bridges in building construction. Even the odd cold bridge will reduce the energy efficiency of the building, leading to higher energy costs for the users and, at the worst, failure to comply with the requirements of the latest building regulations. The A. Proctor Group has placed significant investment in developing some of the most effective highperformance solutions to address the challenge of hard-to-insulate areas such as window and door reveals, ensuring a fabric-first design approach and reducing the gap between “as-designed” and “as-built”. Contact The A. Proctor Group www.proctorgroup.com @proctorgroup 66 TC NOVEMBER <strong>2022</strong>
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November 2022

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