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Wall Build-Ups

EWI Pro systems are built to last, offering a range of external wall solutions for improving thermal comfort and external appearance. The following are some typical external wall insulation systems using EWI Pro materials. As demonstrated, our systems are highly versatile and can be used to create numerous external wall insulation systems for a range of properties and substrates.

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Structural Insulated Panels (SIPs) Render Only image

Substrate Preparation

The substrate must be clean, dry and dust free.

Parge Coat

A parge coat must be applied to the substrate to prime and level the surface. The EWI-269 Lightweight Basecoat can be applied up to 10mm thick to create a parge coat.


The basecoat reinforcement layer is applied to the insulation boards and consists of the EWI-225 Premium Adhesive. The reinforcement layer creates a smooth surface before applying the render.

Fibreglass Mesh

Fibreglass reinforcing mesh is embedded within the basecoat adhesive to enhance the tensile strength and crack resistance of the render system.

Render Primer

The render primer is painted onto the reinforcement layer to ensure that the render adheres to the basecoat, and to contribute towards a durable render finish.

Decorative Finish

EWI Pro offer a range of coloured renders, all of which can enhance the external appearance of the property. Each render provides a long-lasting, crack-proof finish and come with a range of advantages for the building structure. We recommend choosing a breathable render for use with Wood Fibre insulation.

  • Substrate Preparation
  • Parge Coat
  • Basecoat
  • Fibreglass Mesh
  • Render Primer
  • Decorative Finish
Structural Insulated Panels (SIPs) Render Only
SIPs Panels consist of an insulating foam core sandwiched between two render carrier boards. SIPs are extremely strong, energy-efficient, and cost-effective, especially when paired with our Premium Basecoat, and finished off using a decorative and breathable thin coat render system.                          
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