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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) Wood Fibre System image

Substrate Preparation

The substrate must be clean, dry and dust free.

Starter Track & Clip-on Profile

The starter track is attached to the substrate above the DPC. This provides a level surface for the insulation to sit on; it also protects the base of the insulation against damp.

Wood Fibre Insulation

Wood Fibre insulation is renowned for being extremely breathable and eco-friendly. Wood Fibre offers the building enhanced solar and acoustic protection and is ideal for improving thermal performance and allowing the building to breathe.

Mechanical Fixings

Mechanical fixings are used as the primary method of securing the insulation to the substrate. Stainless steel wood screws with fixing discs should be used for Wood Fibre insulation.


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
  • Starter Track & Clip-on Profile
  • Wood Fibre Insulation
  • Mechanical Fixings
  • Basecoat
  • Fibreglass Mesh
  • Render Primer
  • Decorative Finish
Structural Insulated Panels (SIPs) Wood Fibre System
Wood Fibre insulation system is ideal for use on SIPS Panels as they offer unrivalled breathability and vapour permeability. The result is excellent thermal performance due to the system’s seamless thermal envelope, and a decreased risk of water vapour build-up. The insulation boards are secured to the substrate using Metal Pin Mechanical Fixings. 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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