External walls form the envelope of any building, protecting everything inside. There are many types of external wall insulation solutions that can meet your project requirements. They also cover the greatest surface area, making them a prime area for heat loss – about a third of all the heat lost in an uninsulated home escapes through the walls.1 With ROCKWOOL external wall insulation and solutions, living spaces can be made warm, energy efficient and compliant with modern building standards – as well as gaining additional benefits in terms of acoustics, indoor comfort and fire safety. Discover the importance of insulation for exterior walls, and the positive impacts it can bring. Table of contents Why do we need external wall insulation Calculator and savings Why choose ROCKWOOL solutions Case Studies Installations Applications Downloads and resources Financial support FAQ Other relevant applications Find inspiration, guides and reports External Wall Insulation Products Cladding solutions RAINSCREEN DUO SLAB® Versatile stone wool insulation for ventilated facades, RAINSCREEN DUO SLAB® is BBA approved and Euroclass A1 non-combustible. When installed correctly, RAINSCREEN DUO SLAB®’s proven thermal and acoustic performance will remain consistent year after year. Learn more Slab Products Timber Frame Slab With an increased focus on compliance with thermal, fire and acoustic performance for external walls, ROCKWOOL Timber Frame Slab has been engineered with an optimal density offering a low thermal conductivity, exceptional resistance to fire and outstanding sound absorption. The non-combustible stone wool insulation has dimensions specifically designed to enable quick and easy installation into timber frames. Learn more Slab Products Steel Frame Slab ROCKWOOL Steel Frame Slab is Euroclass A1 non-combustible and capable of withstanding temperatures in excess of 1,000°C while providing low thermal conductivity of 0.034 W/mK and delivering proven noise reduction. It has been designed specifically for use in steel frame buildings including ventilated façade constructions to help specifiers meet thermal, acoustic and fire performance requirements. Learn more Cladding Roll Light and right. Commercial or industrial framed buildings can reap the rewards of lightweight, fire resistant cladding wall insulation that also offers thermal and acoustic benefits. ROCKWOOL Cladding Roll has been specifically developed for use as an economical solution for projects that require dimensionally stable, consistent thermal performance in both roof and wall applications. Learn more Cladding Solutions External Wall DD Slab ROCKWOOL External Wall DD Slab insulation has been specifically developed for use within external wall insulation systems. Such systems can considerably enhance both the thermal and acoustic performance of a building. Learn more Share Why do we need external wall insulation? The building envelope is where heat loss commonly occurs, and the outside walls are responsible for a large percentage of the heat loss. External wall insulation can significantly reduce heat loss – improving the building’s energy efficiency, as well as cutting emissions and reducing fuel costs. If you start your project thinking ‘fabric first’ and install the insulation correctly from the start, you may receive a higher energy performance certificate (EPC) rating. A good EPC rating can allow developers and housebuilders to make their properties more profitable as well as commercially appealing to buyers. Key benefits of external wall insulation: Less heat loss Lower energy bills Protected building structure Lower temperature fluctuations Reduced condensation Relevant resources Thermal Properties of Stone Wool Learn more Fire Resilience of Stone Wool Learn more Routes to Compliance PDF 4.1 MB Fire Safety and Tall Building Facades Request CPD Creating Resilient Timber Frame Buildings Request CPD Calculator and savings The exact costs and savings from external wall insulation will depend on the size of the area being insulated and how much insulation is required. It is important to address the external wall as a complete system, and take into consideration thermal bridging. For example, around windows, doors, and floors. You can – of course – also decide to go above and beyond what is required by minimum regulations. Use our U-Value Calculator to work out the thermal performance of your walls. ROCKWOOL can also provide technical support in different ways, using online digital tools or calculations from our technical experts. “There are many simple yet effective ways to insulate your home, which can significantly reduce heat loss while lowering your heating bills.” Energy Savings Trust Learn about energy efficiency Why choose ROCKWOOL solutions? In using ROCKWOOL insulation, you can simplify the specification process. We offer a proven and tested comprehensive range of stone wool insulation solutions that deliver optimum performance for outside wall insulation. ROCKWOOL benefits include2: Fire resilience Temperature maintenance Noise reduction properties Robustness Sustainability Water repellent and vapour permeable Flexibility for innovative building design ROCKWOOL external wall insulation is central to developing energy-efficient walls, and meets regulatory requirements by providing continuous insulation for residential and commercial buildings. Fire resistance also adds an extra layer of safety. Non-combustible ROCKWOOL stone wool insulation can withstand heat above 1000°C3 – ideal during construction or renovation of high-rise buildings, which often face the greatest fire risk. ROCKWOOL insulation is both water repellent and vapour permeable, which means it repels water, yet remains breathable, limiting the risk of condensation. Find ROCKWOOL products ROCKWOOL boasts excellent thermal performance both in winter and summer. Stone wool slabs can add significant mass to the building envelope, ensuring summer comfort. The fibres in the tightly butted slabs effectively knit together, significantly reducing heat loss that would otherwise be caused by gaps between slabs. Erica Bazzini GLOBAL PRODUCT MANAGER, ROCKWOOL GROUP Case Studies The problem Wilmcote House flats, an iconic Portsmouth landmark, had become blighted by mould, damp and condensation. Many people living in its three connected blocks – across 100 maisonettes and 11 ground-floor flats – were in fuel poverty, and residents were not typically heating their homes to the comfort temperature of 18°C set by the World Health Organisation (WHO). The solution Renovation aimed to ease fuel poverty by making the buildings naturally warmer and less susceptible to damp – with a target to reduce heating demand by 90 per cent. Meanwhile, a deep retrofit was launched to extend the lifetime of Wilmcote House by another 30 years. The result ROCKWOOL external wall insulation helped to reduce draughts, condensation and mould. Thermal performance and air tightness were improved thanks to the fitting of a 300/400mm zone fixed to external steel frames, which were newly assembled. Find more case studies It’s about future-proofing the property and moving away from the sticking plaster approach. Due to the fabric improvements, we’re now more confident that the residents don’t need as much heating in their properties. In fact, we’re looking to take out some of the existing storage heaters so that there is a maximum of two per property — one in the lounge and one in the downstairs hall. Steve Groves HEAD OF BUILDING MAINTENANCE AT PORTSMOUTH CITY COUNCIL Read more about Wilmcote House Installing With the various solutions available for external wall insulation, there are many different installation requirements. For cavity walls you can install granulate, partial and full fill slabs, while for timber frame you need products with flexible edges. High-density slabs or lamellas are necessary for ETICS and ventilated facades, with prefabricated sandwich panels or slabs with cut-outs best for metal walls. More detailed instructions can be obtained from the product datasheets which can be found on the product pages. Some overall tips: Measure your walls – measure the size of your external walls first to ensure you have enough installation material. Choose the right product – assess the shape, size and material of your external wall to help decide on the best insulation product and installation method to use. Consider the building use – choose the best external wall insulation whether it’s for a commercial, residential or industrial property. Installation guides for professionals Applications Insulation Cladded Façade Insulation ROCKWOOL insulation for cladded façade systems can boost energy efficiency, fire resilience and acoustic performance. Find out more today. Learn more Insulation Metal Wall Insulation Metal wall insulation improves building performance and operating costs for constructions with metal wall systems. Learn more Insulation ETICS Apply multilayer insulation ETICS solutions to the external walls of a new or existing building. Learn more Insulation Timber Frame Insulation Timber frame insulation provides strong acoustic, fire resistant and thermal properties. Learn more Insulation Cavity Wall Insulation Cavity wall insulation reduces heat loss, energy use and cuts heating costs. Discover the benefits of ROCKWOOL cavity wall insulation today. Learn more Downloads and resources PDF 4.1 MB Routes to Compliance Download Brochure PDF 847.1 KB EWI System Holders Guide Download Guide PDF 609.0 KB Rainscreen Acoustic Reference Guide Download Guide jpg Product Application Guide Download Guide Download our interactive insulation specification guide Product Documentation The ROCKWOOL Red Book To help save specifiers’ time and make it easier to identify the correct insulation solutions for facades, walls, floors and roofs, ROCKWOOL has launched the new ROCKWOOL Red Book – a fully interactive guide which provides digital access to technical data, product certification and a wide range of specification support materials. Download ROCKWOOL Red Book Financial support Check the Energy Savings Trust website to see whether there are any financial support schemes available for external wall insulation. Other applications that might interest you Roof Insulation Roof Insulation We supply an array of roof insulation products for any type of build, increasing energy efficiency. Discover the benefit of ROCKWOOL roof solutions today. Read more Insulation Internal Wall Insulation Internal wall insulation reduces heating bills and boosts indoor comfort. Discover the benefits and strengths of ROCKWOOL wall applications today. Learn more Insulation Floor Insulation ROCKWOOL floor insulation is made from premium stone wool and can improve a building’s thermal and acoustic performance. Learn more [1] https://energysavingtrust.org.uk/home-insulation/cavity-wall [2] https://www.rockwool.co.uk/why-stone-wool [3] https://www.rockwool.co.uk/why-stone-wool/ [4] https://www.euro.who.int/__data/assets/pdf_file/0008/97091/E89887.pdf [5] https://gov.wales/planning-permission-external-walls [6] https://www.cambridge.gov.uk/media/2747/external-wall-insulation-guidance.pdf Organization ROCKWOOL Products & Applications Products and Systems Roof Insulation Floor Insulation Ceiling Insulation Internal Wall Insulation External Wall Insulation HVAC Insulation Passive Fire Protection Acoustic Insulation Interactive City Resources and Tools Tools Product Documentation Building Regulations Resource Hubs Advice & Inspiration Frequently Asked Questions Case Studies Learning Why stone wool Closer to our Customers Reduce Energy Bills ROCKWOOL Knowledge Hub About Sustainability News Events Business ethics Careers Stockist Finder Trademarks and Policies Contact Us ROCKWOOL UK ROCKWOOL Limited Registered in England and Wales: 972252 Pencoed, Bridgend CF35 6NY United Kingdom Tel: 01656 862 621 Contact Us Social .cls-1{fill:#d20014;} United Kingdom (English) (UK) Legal Notice Privacy Statement Trademarks and Policies Cookie Declaration Declaration of Performance Copyright© 2021 ROCKWOOL Limited Hi, we've noticed you are connecting from Belgium ROCKWOOL is also available in French. 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