Recycled PVCu beads render steel alternatives unsustainable

Sustainability is a big issue in construction. During 2021, the industry was responsible for over 10 million tonnes of carbon dioxide emissions in the UK alone [1].  When building sustainability into homes or structures, the details matter. Even a small environmental benefit, like choosing more sustainable materials for often overlooked components, is multiplied over a large development. Considering this, numerous modern construction projects have been utilising PVCu beads from Renderplas. Made from up to 100% recycled materials, these beads offer a sizeable reduction in carbon footprint when compared to traditional stainless steel alternatives.

The carbon cost of stainless steel

The fact that stainless steel production is carbon intensive is no secret. The International Stainless Steel Forum (ISSF), using data from its members and Yale University, calculated that the total CO2 cost of producing a ton of stainless steel with 50% recycled scrap equated to 2.9 tons [2].  This encompasses extraction of ores, manufacture of alloys, the stainless steel production process and the large amount of energy required for all stages.

Building sustainably means utilising less polluting materials. Therefore, finding a robust, suitable alternative to steel during the planning stage can contribute to lowering the carbon footprint of a project.

Getting a bead on sustainability

Recycled PVCu offers a distinct advantage in this regard. Conducting a cradle to grave analysis over a projected lifespan of 100 years, an independent assessment found that the PVCu in Renderplas beads only produced 0.74 tons of CO2 equivalent per ton installed [3].  This makes the lifetime carbon footprint of a PVCu bead nearly four times less than the production of stainless steel as a raw material. This is before the additional manufacturing to actually make a stainless steel bead, which is also energy intensive.

The reason for such environmental performance is that Renderplas uses recycled PVCu. It utilises 100% of this material in its white stop beads, corner beads and bellcast beads – while its movement joints and beads of other colours contain a minimum of 75%. This approach means that Renderplas products can be produced using less resources and energy.

In common with stainless steel, offcuts from installation can be recycled, just like the complete PVCu bead after deconstruction. Forgoing the widespread usage of virgin raw materials, including plastics, means Renderplas’ designs compare favourably with other materials too. The company estimates that the environmental impact of using a PVCu extrusion with no recycled material is six times worse than using Renderplas recycled products. Furthermore, unlike steel, PVCu offcuts can be recycled easily at the manufacturing site.

The role of recycled PVCu render beads in sustainable developments is illustrated by their compliance with government Part L building regulations, which are steadily reducing the carbon footprint of all new homes. With the latest regulations looking to be more ambitious and innovative than ever before, choosing Renderplas products actively contributes to improving sustainability in construction.

Environmental benefits beyond construction

High performance in application maximises the environmental benefits. Guaranteed to match the lifetime of the render, or to last at least 25 years, PVCu beads outlive their metal counterparts. This is thanks to superior corrosion, impact and spalling resistance. Such qualities enable a longer gap between replacement, saving further resources. Renderplas beads also eliminate the cold bridges synonymous with steel designs, improving building insulation and energy efficiency.

Recycled PVCu complies with Registration, Evaluation, Authorisation and restriction of Chemicals (REACH) legislation. This ensures that the material is ecologically benign, non-hazardous in watercourses and non-toxic if ingested.

Starting small with sustainability

Daniel Leedham-Green, Managing Director at Renderplas, concludes: “We are under no illusions that beads for plastering or rendering are a very minor part of a construction project. However, when improving sustainability, small gains add up over a large development. Recycled PVCu beads offer contractors, builders and architects an easy sustainability win for any structure, providing a one-to-one replacement for stainless steel designs with no compromise in application performance.”

[1] Carbon dioxide emissions from the construction industry in the United Kingdom (UK) from 1990 to 2021 – Statista
[2] Stainless Steel and CO2: Facts and Scientific Observations – ISSF
[3] Environmental Profile: PVCu beads for rendering, plastering and dry lining applications – Renderplas 

Renderplas was formed in 1990 to offer the plastering industry a new concept in beading. The first manufacturer of PVCu beads in the UK, Renderplas is the leading exponent in the field.

The business sets out to address the shortcomings of traditional profiles by designing a range of beads in PVCu to suit the British and Continental market. The key benefit of PVCu beads is that they use the most cost-effective, non-corrosive material to produce robust plasterer friendly beads. Renderplas PVCu beads conform to BS EN 13914-1:2016 – External Rendering.

Renderplas products are designed to be unobtrusive with an extremely narrow arris, making it ideal for scratched or scraped finishes. Very popular with major house builders, its beads are available in white or ivory as standard to blend with most coloured renders. However, in order to give architects and contractors even more freedom to use through-coloured renders in more vibrant colours, a range of beads in 7 further colours are also available for popular render depths.

Used internally, whether, in conjunction with wet plastering or dry lining, they will not stain during lengthy drying out periods and offer superior protection against impact in heavy traffic areas.

By specifying a Renderplas PVCu bead, the problems associated with traditional beads and the aggravation of costly callbacks are avoided. Two different CAD file formats are available for Renderplas profiles from the Downloads page of its web site. Alternatively, register with FastrackCAD to use all of their architectural database services.