polymer render

Polymer render is essentially just a term for a render that contains ‘polymers’ as part of its ingredients. Different polymers can give the product different characteristics, often enhancing flexibility and increasing weatherproofing capabilities. The technology behind polymer renders is fairly new, but they are steadily starting to overtake the common sand and cement render in terms of popularity. In today’s post, we’re going to explore the different types of polymer renders within the EWI Pro range, and explain a little bit about the different characteristics that they offer.

Benefits of Polymer Renders

  • Hydrophobic
  • Elastic
  • Highly adhesive
  • Typically through-coloured
  • Pre-mixed
  • Vapour permeable (depending on the type of render)
  • High impact resistance

EWI Pro Polymer Renders

EWI Pro offers a range of polymer renders. We often refer to these as ‘thin coat renders’ due to the method of application. Thin coat polymer renders are applied in an incredibly thin layer directly onto a basecoat layer. The EWI Pro polymer renders that we sell all come pre-coloured and ready-to-use in 25kg tubs. They also contain grains (in a range of sizes to choose from) so that you can decide on the type of textured finish that you want.

Because of the fact that it contains silicone, Premium Bio Silicone Render falls into the category of polymer renders. The silicone within the render means that it is highly flexible, vapour permeable and also in the case of the Premium Bio, extremely hydrophobic and self-cleaning. This is ideal for areas where there is a high level of vegetation and a bigger risk of organic overgrowth.

Silicone render can be considered as the next step down from the Premium Bio in terms of performance. This is our classic render, offering vapour permeability, flexibility, and self-cleaning capabilities. Silicone render is a classic choice for a premium, long-lasting finish.

Silicone Silicate render is our best value polymer render in terms of the level of performance it offers. This is a hybrid render, as it is a mixture of both silicone and silicate and subsequently offers the same level of breathability as our other silicone-based renders but with less of a self-cleaning effect.

Our acrylic polymer render differs from our silicones. It’s extra UV resistant, so it will retain colour pigment really nicely, and it’s also great for impact-resistance. Acrylic render is a standard classic choice and is great if vibrancy in colour is an important factor. However it does lack the vapour permeability that the silicones provide, so this is probably something to consider for long-term performance.

Reinforcing Polymer Render

All of our polymer renders the need to be applied on top of a reinforced basecoat. Fibreglass Mesh is embedded within the basecoat at the application stage to enhance the tensile strength of the whole system. Therefore, the render alone without this basecoat reinforcement layer will not provide a long-lasting finish.

It’s also important to apply these renders onto a completely smooth surface because they are applied at a thickness that matches the chosen grain size (so between 1-3mm), so any slight unevenness in the substrate behind will be completely visible underneath the render.

Polymer modified renders are without a doubt the future of rendering, so give us a call if you’re interested in having this type of render installed on your property!

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