The Ultimate Guide to Continuously Operated Recirculated Systems

Building Products Index Ltd Pipes, push fit fittings Leave a Comment

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Continuously operated recirculated systems, also known as secondary hot water circulation or ring main systems, are an essential component in modern plumbing. These systems ensure that hot water is readily available throughout a building while promoting better hygiene. In this guide, we’ll explore how these systems work, where they are commonly used, and why they are a valuable addition to any plumbing skillset.

Applications of Continuously Operated Recirculated Systems

These systems are particularly popular in large sanitary environments such as healthcare facilities and hospitality settings. Their design significantly reduces the risk of bacterial growth in the pipes, ensuring a hygienic water supply. This makes them indispensable in settings where the cleanliness of the water is paramount.

How Do They Work?

Continuously operated recirculated systems use a pump to circulate hot water through the pipework continuously. This constant flow prevents stagnation and maintains high water temperatures, which inhibits bacterial growth. By reducing opportunities for bacteria to thrive, these systems also lower the risk of Legionnaire’s disease.

Understanding Legionnaire’s Disease

Legionnaire’s disease is a severe form of pneumonia caused by the Legionella pneumophila bacteria, often found in stagnant water. The disease can be life-threatening and is contracted by inhaling water droplets containing the bacteria. Continuously operated recirculated systems combat this by maintaining a water temperature of at least 60°C, which prevents the bacteria from forming.

Ensuring Hot Water Quality

Unlike other hot water systems, continuously operated recirculating systems are easier to disinfect. Two main approaches can be employed:

  1. Thermal Disinfection: Designed to withstand temperatures up to 70°C, the system can be disinfected by heating the water to this temperature and rinsing each tap or sampling point for at least three minutes.
  2. Component Quality: Using high-quality components like the PE-Xc multilayer pipes ensures exceptional performance and longevity.

The Role of Tigris K5

Tigris K5 is a multi-layer composite pipe designed for potable water and heating applications. It offers several advantages over traditional copper piping, such as:

  • Five-layer construction: Includes an inner layer of cross-linked polyethylene, an outer layer of HDPE, and an aluminum layer in between.
  • Oxygen diffusion resistance: Prevents oxygen from entering the water system, reducing the risk of corrosion.
  • Thermal expansion comparable to copper: Ensures stability in varying temperatures.
  • Flexibility and fewer fittings: Speeds up installation and lowers material costs.

Unique Features of Tigris K5

  • Acoustic Leak Alert: Emits a loud whistle to identify any unpressed fittings.
  • Opti Flow: Enhanced inner bore improves flow performance.
  • Multi Jaw: Can be pressed with all common profiles.
  • Easy Fit: Allows for easy pipe insertion without calibration.
  • In4SureTM: Provides clear visual cues for unpressed sleeves.
  • Ultra Seal: Offers reliable O-ring sealing, tested beyond market standards.
  • Pipe Grip: Ensures pipes stay in position before pressing.

Providing Hygienic Water Supplies Across the UK

Traditional hot water systems can foster bacterial growth due to stagnant water. Continuously operated recirculated systems maintain water temperatures above 60°C and ensure constant water movement, significantly reducing this risk. They also guarantee consistent water pressure and availability, making them a superior choice for maintaining a hygienic water supply.


As the demand for these systems grows, plumbers who can expertly install and maintain continuously operated recirculated systems will find themselves in a thriving market. For more information or assistance with your project, contact our UK technical support center. Our experienced team is ready to offer advice and expertise. Additionally, explore our range of technical downloads, installation guides, and product details available online.

Don’t hesitate—get in touch today and take advantage of our comprehensive resources.

Visit Wavin UK | Tigris K5 – New Press Fit Pipe system for more information.

New Retainer-Rock® walling system keeps residents and property safe and secure…

Building Products Index Ltd Concrete, Precast Leave a Comment

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With an increase in an aging population and the need for suitable accommodation, residential parks are becoming more and more popular as people want safe, secure and landscaped areas to live.

Catering for the over forty-five age group, Sandy Oaks is one such residential park. Situated in 35 acres of picturesque woodland, in an idyllic rural setting, close to Sherwood Forest, it boasts 149 individual homes, all with their own garden and driveway.

Due to the topography of the park, a retaining wall solution was required 2.5 meters high that would protect the homes and gardens from landslips and the egress of land.

The retaining wall not only needed to be strong & secure but also had to fit in aesthetically with the surrounding countryside and architecture. The answer? Elite Precast Concrete’s Retainer-Rock® modular walling system.

After discussing the different retaining walling options with Paul Cartwright, from Elite Precast Concrete, the contractor decided to go with Elite’s new walling system, Retainer-Rock®.

The Retainer-Rock® walling system answered both his and the client’s need for an off-the-shelf walling product that was available within days of ordering and was easy to install, even when using it for the first time and despite the adverse weather, the client built three walls within days. Most importantly though it blended well into the appearance of the residential park.

With two face finishes currently available (Cobblestone and Liscio Stone), Retainer-Rock® is a secure and low maintenance retaining wall solution that will continue to look good as it weathers.

For more information or technical advice, contact 01952 588885.


Axis Entrance Systems Case Study: Harrogate District Hospital Refurbishment

Building Products Index Ltd Doors, Sliding, Uncategorized Leave a Comment

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Flo-Motion single slide type F11

Flo-Motion single slide type F12

Video: Axis Harrogate Hospital

INDUSTRY: Healthcare

CLIENT: Harrogate District NHS Foundation Trust

CONTRACTOR: Whitaker & Leach

ARCHITECT: Bridger Carr Architects


The refurbishment and expansion of the Wensleydale Ward at Harrogate District Hospital, to enable the creation of a new dedicated cardiology and respiratory ward. Our brief for the project was to design, supply and fit the doors for the project.


The main challenges for this project included: space-saving, to maximise usable areas for staff and patients; the adaptability of the doors to be able to easily flip between providing excellent two-way visibility for staff and patients and providing privacy, when required; and the ease of operation to assist staff in a busy environment.



Working with the architects and contractor, the solution specified was seven door-sets from our award-winning Flo-Motion Manual Sliding Doors range. These included 4 or our Flo-Motion® F11 door type and 3 of our Flo-Motion® F12 door type – all glazed, and with manually operated interstitial blinds.

Contrasting two-colour powder finishes were applied with RAL 7037 satin used for frames and fixed panels, and RAL 7038 satin used for sliding doors with the handles in stainless steel.



Our Flo-Motion® door-sets provide several significant benefits for patients and staff, which include:

  • Our Flo-Motion® Manual Sliding Doors has helped create a department with excellent light transfer and a feeling of spaciousness.
  • Our doors provide clear visibility between patients and staff with the interstitial blinds open, or privacy, by closing them, as and when required.
  • The operation of our doors, which were force-tested with an average reading of 7.34N, makes life easier for staff.
  • The use of our Flo-Motion® Manual Sliding Doors has created an attractive, efficient, effective and improved working environment for staff, as well as an improved patient experience.

“Axis provided a professional service and solid coordination advice during the design stage so there were no surprises when the project came to site. They were always on-hand for technical queries and the Client was very pleased with the finished product.”

Deborah Carr (Bridger Carr Architects)

“Axis were good to work with, providing quality advice and guidance through the process. The installation phase was on time, well executed and the work was carried out with care and professionalism.”

Keiran Leach (Whitaker & Leach)

T: 01604 212500         W:

Ion Glass: linking buildings with structural glass

Building Products Index Ltd Architectural Glass, Glass Leave a Comment

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A structural glass link is the optimum way to connect buildings, providing a stylish interface that offers minimal physical intervention and maximum light flow

Above:  An L-shaped glass link connects separate buildings in this luxury single-storey barn conversion. A bespoke design by Ion Glass that ensures the corridor interfaces flawlessly.

Ion Glass are leading specialists in bespoke structural glass, providing an individually tailored service to create glass links across a wide variety of heritage, residential and commercial buildings. They detail some of the key advantages and considerations when installing a glass link:

  • A structural glass linkway meets many different requirements from a simple weatherproof passage between buildings to an integral element of the property
  • A glass link will allow for movement between two buildings of very different age and structure.   In listed or heritage properties, a glass link is often the only approved option to provide an effective interface between structures with different construction techniques
  • Minimal footings are required – the glass linkway can be channel set and fully sealed with silicone
  • Single glazing will provide a fully weather resistant glass installation:  double glazing will allow the glass linkway to become an integral part of the structure of the building, fully compliant with heat loss requirements
  • There are no height or size restrictions, Ion’s technical team will advise on the structural requirements to ensure the finished glass structure is wholly compliant
  • Ion’s glass linkways can be produced without visible fixings, incorporating structural glass fins or structural glass beams to give a robust yet minimal result
  • Glass linkways can be used internally as well as externally and at different levels, incorporating a glass floor if required

Ion Glass offer a full service from concept to the finished product, including design input as required, detailed CAD drawings, all specialist glass calculations, a fully experienced installation team and management of all logistics, including crane hire as necessary.

Above: this suspended glass linkway designed and installed by Ion Glass links a new master bedroom suite to the main house.  Constructed from double-glazed panels, the inclusion of a glass floor allows light to reach the walkway below.

Above: This unusual T-shaped glass link by Ion Glass connects home and garage whilst also creating a spectacular entrance to a swimming pool – it is constructed from double-glazed panels for heat retention












Above:  This deceptively simple glass link transformed a draughty passageway into a useful space connecting this modern home to the garage.  A glass roof ensures maximum light.

Ion’s bespoke structural glass installations can be found in public buildings, churches, commercial properties and beautiful private homes across the UK and overseas.

Visit for more information on bespoke glass linkways, structural glass porches,  glass doors, glass screens, internal or external balustrades,   or other architectural glass installations.

If you have a project you’d like to discuss, call us on 0345 658 9988,  send an email via or click on the enquiry form on our website.

Our expert team will discuss your individual requirements and provide a full technical support and installation service whether you are managing a project for a church or heritage building or commissioning structural glass for leisure, residential, or commercial properties.

Beating the Heat with Dales Aluminium Solar Shading

Building Products Index Ltd Solar Shading Leave a Comment

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Dales supplies Solar Shading Solutions for Solihull Retirement Village:

Dales Fabrications supplied their Aluminium Shadex 150 Solar Shading, finished in PWF1 Timber Effect for Solihull Retirement Homes.

Whilst enhancing the architectural appeal of the project, integrating this system into the design also ensured that the buildings would effectively manage solar heat gain from day one, allowing more comfortable living conditions for residents and improving energy efficiency. Moreover, their installation aligns with the guidelines set out by the Part O regulations introduced in June 2022.

The timber effect finish from Dales made it possible to achieve the appearance of timber without the fire risk or risk of algae, warp, deviation and regular turning traditionally associated with timber blades.

Dales also supplied aluminium balcony cladding with self-draining soffits, privacy screens, and ‘window-frame’ cladding for the project.

The £47m retirement village in partnership with the ExtraCare Charitable Trust accommodates over 300 homes for over 55’s and was designed by DLA Architecture.

The need for action:

As we head into summer, many of us will be enjoying the warmer, longer days. However, for several residents in the UK, the increased solar gain and excessive heat create uncomfortable living conditions and may even pose serious health risks.

Whilst the conversation in the UK has typically centred around reducing heating costs and increasing insulation in homes, MPs are increasingly expressing concern and urging immediate government action to protect tenants from the adverse effects of overheating, which can cause health issues such as heat exhaustion and dehydration. Furthermore, there is an urgent call to reduce the need for air conditioning, with The Intergovernmental Panel on Climate Change suggesting that by 2050, the average number of days a year Europe will require air conditioning will have risen by 30%.

Additionally, this June marks the second anniversary of the implementation of the new part O regulations, which aim to ensure that new residential buildings are designed to minimise overheating and therefore protect occupants’ welfare. The regulations promote sustainable building practices by emphasising energy efficiency and passive cooling techniques. They apply specifically to new residential buildings, including dwellings, common areas of flat blocks, care homes, and halls of residence.  Developers, architects, and builders must all comply.

Solar shading as a solution:

The Building Research Establishment suggests that the installation of external solar shading systems is one of the most cost-effective and least adverse methods of reducing solar gain and therefore, emissions of carbon dioxide during building use. Research indicates that a well-designed solar shading system can pay for itself through energy cost savings within five years.

Solar shades are designed to reflect the sun’s rays, significantly reducing solar heat gain. Aluminium solar shades in particular are a great option as they are durable, weather-resistant, and require minimal maintenance. This makes them an efficient long-term investment for providing an effective, stylish, and durable solution to keeping accommodation cool and comfortable, whilst meeting the requirements of Part O regulations.

Dales Fabrications design and manufacture an extensive range of standard and bespoke aluminium solar shading solutions. Additionally, Dales can advise on the size of the necessary projection and different methods of support available for the different shading types. More details are available at


In addition to their product offerings, Dales can also provide in-practice CPD seminars that cover content about Solar Shading systems:

–          Solar Shading: Form, Function and Fire Safety with Part O Update

–          Solar Shading Systems: Compliance with Part O, Part L, and Part B

–          Solar Shading: Form, Function, Fire Safety & the Scottish Building Regulations

–          Solar Shading Systems: Compliance with Scottish Building Regulations

Dales’ CPD seminar ‘Solar Shading Systems: Compliance with Part L: Conservation of Energy and Part B: Fire Safety’ was spotlighted in May’s RIBA CPD Showcase, in the Sustainable Architecture category.

To read more about the CPDs offered, and to book your place you can visit

Photography by a2n (

Fire Retardant Waterproofing

Building Products Index Ltd Waterproof Membranes, waterproofing Leave a Comment

View the Delta Membranes entry on BPindex

Technical Drawings – MS Fire Type C Drained Protection – Delta Membranes

Delta Fire Retardant, Type C Waterproofing – Delta Membranes

Comparison Test of Delta MS 500 Fire – Delta Membranes

Fire retardants serve a crucial role in fire safety measures, fire retardant materials possess the unique characteristic to slow down or even halt the spread of fire. This key feature makes them an essential element in fire safety management.

Typically, the concepts of water management and fire safety are not concurrently considered due to their contrasting nature and effects.  Though it may initially appear far-fetched, upon closer inspection, it is not as irrational as it may first seem.

Waterproofing refers to the technique of preventing water from penetrating a structure and controlling the flow of water and water vapor within and out of the structure.  Type C waterproofing integrates two key elements for optimal functionality: Cavity Drainage Membranes and Basement Drainage Systems. These components work in unison to ensure efficient water management in structures.

Type C Cavity Drainage Membranes tend to be crafted from High-Density Polyethylene (HDPE); a tough, durable plastic material known for its high strength-to-density ratio. This material offers excellent resistance to impact, moisture, and chemicals, ensuring long-lasting performance and reliability.  However, polyethylene possesses flammable characteristics.  It can easily catch fire under certain conditions, due to its chemical composition.  When exposed to certain conditions, plastic can undergo a transformation where it starts to melt and subsequently produce droplets. This occurrence is crucial to consider when dealing with plastic materials.

The Euro class system is an analytical tool that evaluates various fire-related characteristics. These include ignitability, the rate at which flames spread, heat emission, smoke generation, and the likelihood of producing flaming droplets or particles.  Products achieving A1 and A2 classification are defined as non-combustible under Regulations.

The Euro class system is designed to unify standards throughout the European Union. It systematically classifies products into seven distinct fire reaction classes, from A1 to F, with F being the most combustible. This classification is determined through a specific test or a combination of tests. This professional framework ensures a consistent approach to product safety standards.

The system offers an extended classification, usually linked to fire response classes D through B. This classification relates to smoke production, ranging from s1, indicating minimal or no smoke, to s3, which signifies considerable smoke. It also categorises flaming droplets or particles, from d0 representing no presence, to d2 signifying a significant amount.  This information is crucial in understanding the behaviour and potential hazards of fires.

Delta MS 500 Fire Retardant is a robust Type C, Cavity Drained Protection system, designed to withstand demanding conditions. It holds a Euroclass fire rating of B-S2, d0 (EN 13501-1:2018), an indication of its superior fire resistance.  Delta MS 500 Fire Retardant does not compromise on its strength, durability, functionality, or workability. This makes it an excellent choice for applications where both fire safety and structural integrity are paramount.

The Delta MS 500 Fire Retardant is a product that carries the BBA certification. This seal of approval signifies that this fire-retardant waterproofing system meets the rigorous standards set by the British Board of Agrément. The certification is an assurance of quality, reliability, and safety in fire retardation.

Flame retardants play a critical role in enhancing safety measures in homes or buildings. Their primary function is to delay the spread of fire, thereby providing occupants with crucial extra time to evacuate and firefighters with additional time to intervene. Moreover, they contribute significantly to preventing property damage, not only from the fire itself, but also from potential water damage arising from automated sprinklers or fire control efforts by local authorities.

Delta Registered Installer Network

The Delta MS 500 Fire Retardant system, is accessible exclusively via the Delta Registered Installer Network.  This network is a trusted source for acquiring this high-quality fire retardant.

Always Happy to Help

For all your project requirements, Delta’s Technical Team is a dependable resource. Offering expert advice, comprehensive support, and timely practical assistance, we cater to your specific needs. Reach us at 01992 523 523 or drop us an email at


Building Products Index Ltd Roof tiles Leave a Comment

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Marley’s new and improved Lincoln Clay Interlocking Pantile, with an s-curve profile and thin leading edge, has recently been specified on a new residential property development in Gainsborough, Lincolnshire.

Located in a conservation area, the home, designed and constructed by My Home Developments, had to meet a number of stringent planning requirements. This included the stipulation that only a clay pantile could be selected for the roofscape.

“When it came to selecting the right tile for the roof, we obviously needed to meet planning requirements, but we also wanted to create a beautiful aesthetic that matched the modern design of the home we envisioned,” explains Tom Crowe, founder, My Home Developments.

“Many of the village’s surrounding properties have traditional, plain clay pantiles on the roof, which look great, but can be limited in colour options. We were looking to create a softer, sleeker appearance, so the roof could blend seamlessly with the rest of the new building’s aesthetic. Marley’s new Lincoln clay pantiles enabled us to achieve exactly that, while still meeting planning requirements.”

Marley’s new Lincoln Clay Interlocking Pantile range is available in single coloured Red Smooth, and Rustic Red, which incorporates a flash of dusting to create a more weathered appearance and enhanced kerb-side appeal. Changes have also been made to the texture of the pantile, so it now offers a marked heritage aesthetic, which ensures greater design choice for specifiers such as Tom.

“Creating new builds in well-established locations means we have to be mindful of blending in and collaborate with the planners to ensure we add to the area’s appeal,” explains Tom. “We opted for the Lincoln in the Red Smooth to achieve exactly this, which has provided a really attractive roof that enhances the modern style we were seeking, while still being in-keeping with the other homes in the area.”

Merchant support

Tom worked with one of the UK’s leading builders’ merchants, Jewson, in Lincoln, to discuss the project and source the best roofing tile to meet his needs. He was made aware that Marley had recently relaunched its Lincoln clay pantile range, with improvements to the colourway and texture. And after seeing a number of photographs of the new product, decided it would be ideal.








Ian Milson, Building and Roofing Sales Specialist at Jewson in Lincoln, says: “We’ve worked with Marley for many years, and we had full confidence the new Lincoln would deliver the quality finish Tom was looking for. When it comes to our relationship with our customers, it’s important that we’re able to offer new and innovative products that help get projects completed in the best possible way. Marley’s products enable us to do exactly that. They’re pivotal to all our clients’ roofing projects in the area.”







Cadell Beasley, Area Specification Manager at Marley, says: “The new Lincoln delivers a sleek aesthetic and modern appearance, while still carrying the traditional feel of a heritage clay pantile roof. We’ve worked with important suppliers, such as Jewson, to promote the advantages of the new Lincoln, and it’s great to see it now being specified on projects such as the residential development in Gainsborough.”

Production for the new Lincoln has also moved to Keele in Staffordshire, with the clay used for its manufacture now sourced from nearby quarries. This makes Marley one of the only providers of a British-made clay pantile.








“The decision to transition our production to the UK will deliver environmental benefits too, through a reduction in shipping and transport requirements, and subsequent reductions in associated carbon emissions,” continues Cadell. “It will also provide additional versatility and assurance of product supply for the UK roofing sector.”

Speaking about the end result, Tom concludes: “The relaunch of the new Lincoln was perfectly timed for our development project. The clay pantile not only looks good, but it was also easy to install. The fact that it’s manufactured in the UK is another plus point for us.

“The finished roofscape adheres perfectly to the wishes of the local planners, allows the property to sit seamlessly alongside the neighbouring houses and is a great example of the natural beauty that clay pantiles are renowned for.”

To find out more about Marley’s Lincoln range, click here.

Eurocell Sets Benchmark For Recycled PVCu In Extrusion

Building Products Index Ltd Doors, PVC-U, PVC-U, Windows Leave a Comment

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Eurocell, which operates the largest PVC-U recycling operation in the UK, achieved 32 per cent recycled PVC-U in extrusion in 2023, up from 27 per cent in 2021 – setting a new bar for recycled materials in the design and manufacture of its PVC-U windows and doors.

Eurocell’s dedication to sustainability is demonstrated through its innovative manufacturing processes, where its profiles division blends raw PVC resin with recycled materials sourced from the company’s cutting-edge recycling plants located in Selby, North Yorkshire, and Ilkeston, Derbyshire.

These facilities are pivotal in transforming factory offcuts and old window frames, which would likely end up in landfill, into reusable raw materials. In 2023 alone, Eurocell’s recycling operations saved the equivalent of approximately 3 million window frames from landfill. The business operates a closed-loop recycling system to ensure that waste PVC-U can be reused, significantly reducing environmental impact.

Sandra Gaspar, Head of Recycling at Eurocell, commented: “The increase to 32 per cent in the proportion of recycled materials in our extrusion process, is a testament to our ongoing commitment to sustainability and demonstrates how we are leading the way in PVC-U recycling.

“By integrating more recycled content into our products, we not only reduce our carbon footprint but also provide our customers with high-quality, sustainable building solutions. We are helping the industry reduce waste and lower its carbon footprint, which is what we want our forward strategy to help deliver as we look to make further inroads in our recycling operation.”

Looking ahead, Eurocell has set an ambitious target to increase the proportion of recycled PVC-U in its products to 40% by 2030. The company’s recycling initiatives also extend beyond its own operations and they are actively working with third-party sites to optimise material recovery and reduce waste, aiming to increase the percentage of waste recycled to 88% by 2025 and to 93% by 2030.

Eurocell facilitates efficient PVC-U recycling for installers and fabricators through its closed-loop recycling system. By offering reliable and timely collections from any UK site, Eurocell ensures that PVC-U waste is managed responsibly. The service includes all aspects of waste management, from collection and transport to documentation, with waste transfer notes provided to demonstrate responsible handling – a testament to why the home improvement specialist won “Best PVC-U Manufacturer & Recycler 2023 – UK” at the Design and Build Awards 2023.

With a focus on continuous improvement and innovation, Eurocell is leading the way in PVC-U recycling within the industry, providing sustainable, low-carbon products, to meet the growing demand for sustainable building products.

Sustainable Solutions

Eurocell’s Logik 70mm window system, delivers an energy performance specification of 1.2 U-value. Thisinnovative and sustainable window solution, features over 40% recycled PVC-U in the central core of the profile with virgin PVC-U on visible faces to ensure the same aesthetics and technical performance, but with more environmentally responsible credentials.

Exceeding Energy Efficiency Specifications

Eurocell has been pivotal in product design that not only keeps ahead of legislation changes but alsoenables design flexibility to meet any challenge, with an example being the Modus 75mm window system, with the ability to achieve 0.8 U-Value, offering slim sightlines that replicate those of an aluminium system, while supported with the manufacture process of more than >50% recycled content it drives the dedication to sustainability.

For more information on how Eurocell can assist you in delivering your next project, please contact the team

SOPREMA DuoFlex Systems Achieve UK BBA Accreditation

Building Products Index Ltd waterproofing Leave a Comment

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3rd June 2024 – United Kingdom – SOPREMA, a global leader in waterproofing, roofing, thermal and acoustic insulation solutions, proudly announces that its innovative DuoFlex hot melt single pour system has received UK BBA (British Board of Agrément) accreditation. This esteemed accreditation endorses DuoFlex for a variety of applications including weatherproofing inverted roofs, zero fall roofs, roof gardens, blue roof specifications in combination with stormwater attenuation systems, and protected roofs with limited access in flat roof specifications.

The Ultimate Comprehensive Roofing Solution

DuoFlex products and structural waterproofing systems are designed to meet the dynamic needs of modern construction. They deliver unparalleled performance with key features that set the standard in the industry. With an unrestricted fire resistance classification, DuoFlex ensures maximum safety, using configurations such as loose-laid gravel, sand/cement screed, and cast stone slabs. The system’s hot liquid application guarantees optimal adhesion, creating a fully integrated, robust bond with the roof structure. Its monolithic, self-healing properties provide a seamless, durable waterproof barrier that can repair small penetrations autonomously. Additionally, DuoFlex supports fast-track and phased installations, making it perfect for projects with tight schedules. Backed by substantial warranties – 30 years for the single pour system and an impressive 40 years for the double pour system making it the ultimate solution for your comprehensive roofing needs.

Industry Recognition

“Achieving BBA approval is a significant milestone that underscores the quality, performance and long service life of the DuoFlex systems.” Says Mike Vaczi, Technical Director for SOPREMA UK. “The rigorous testing and evaluation by the BBA confirm that DuoFlex meets the highest standards in waterproofing and durability, supporting sustainable, modern building practices, and contributing to the creation of structures that will last a lifetime”, Mike continues. “Combine this with SOPREMA’s extensive technical expertise from site inspection, project calculations and specifications, core sampling, condition reporting and design consultation, and you can trust in our dedicated team of technical experts to support you with your project from start to finish.”


The UK BBA accreditation of SOPREMA’s DuoFlex hot melt single and double pour systems highlights their exceptional quality and performance. With comprehensive system solutions, superior fire resistance, extended warranties, and self-healing capabilities, DuoFlex is an outstanding choice for modern construction projects. It’s versatility and sustainability credentials make it a leadingproduct in the market.

For more information on SOPREMA DuoFlex systems and to explore how they can benefit your next project, please visit, or contact our technical support team via

Clement manufactures Jansen thermally broken steel windows and doors

Building Products Index Ltd Doors, Steel, Steel doors Leave a Comment

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The manufacture of new steel windows and doors from Jansen cold formed steel profiles is now fully underway at the Clement Windows Group factory.

Clement’s Jansen steel profile windows and doors are suitable for new build projects and replacement work alike. The strong, narrow frames meet the high standards required for thermal insulation, security and fire protection.  Available with both double and triple insulated glass units and with a number of glazing and locking options, they can be fitted into all opening types.

The range includes single and double doors which are appropriate for busy areas due to their durability.

Clement recently supplied fire rated doors and screens from the Jansen range to Grade II* listed City of London Freemen’s School ensuring that the redesigned Sixth Form Centre met current Building Regulations. The internal fire rated doors and screens at the top of the internal stairs are access controlled and linked into the main fire control of the building.

Jansen is one of the leading producers of cold formed, thermally broken steel profile systems for windows and doors. The company is headquartered in Switzerland and is well known for the quality, performance and resilience of its products.

Clement Windows Group manufactures an innovative range of steel windows, doors and screens, specialising in conservation work for both private residences and commercial projects.  A range of conservation rooflights is also available from stock in either a tile or a slate profile, with bespoke options too.

01428 643393