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The Best Basecoat for Rendering?

The Best Basecoat for Rendering

Our range of basecoats is growing more and more extensive, so we thought we’d write about our top of the line basecoat, the Premium Basecoat, which is undoubtedly the best basecoat for rendering. We’ve also released some new branded slogan t-shirts! The ‘All About that Basecoat’ t-shirt is one of our favourites, and we think our installers will love to wear these on-site! So have a read and check out the t-shirt pictures…

All About that Basecoat?

When it comes to finding the best basecoat for rendering, the Premium Basecoat ticks all the boxes. It’s incredibly strong, breathable and flexible to ensure a render system that lasts. We always recommend using the Premium Basecoat on painted or rendered substrates for strength and stability.

As a multi-purpose adhesive, the Premium Basecoat can be used in two ways: for securing insulation boards to a substrate, and as a basecoat for rendering using a thin coat render.

Why use the Premium Basecoat?

Our Mineral Wool insulation system requires the use of the EWI-225 Premium Basecoat. This is because Mineral Wool insulation boards are much heavier than your basic EPS, so they require an extra strong adhesive – much like using super glue rather than plain old PVA.

We’ve previously written all about the difference between all of the EWI Pro adhesives in our ‘Ultimate Guide’ blog post, however to give a brief overview: the Premium Basecoat differs from our Basecoat Adhesive due to the fact that it is made of Portland cement, which is much stronger than other cements therefore creating a stable basecoat for rendering. It also contains strands of fibreglass within the material, ensuring extra tensile strength and flexibility. This means that the adhesive remains strong and stable, but also has a level of flexibility to ensure the render on top stays free of cracks.

As part of the reinforcement basecoat layer, the Premium Basecoat works well in conjunction with a Fibreglass Mesh, which is embedded within the basecoat. Each strip of mesh is overlapped, so any expansion or contraction of the external walls during heating and cooling will not cause the basecoat to crack because of the Fibreglass Mesh.

Why Choose a Breathable Basecoat?

Choosing a breathable basecoat with a breathable render finish (such as our Silicone Silicate render and Silicone render) ensures one key advantage: water vapour can pass easily through both layers of material.

This means that cracking and blown render will be significantly reduced, as well as build-up of damp within the render system. Breathable materials are also essential for older properties to ensure that the building fabric remains structurally sound.

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