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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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Solid Timber Construction Thoma Holz 100 - 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 consists of the EWI-225 Premium Adhesive, which is applied directly to the substrate. The adhesive is used to create a smooth surface before rendering.

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
Solid Timber Construction Thoma Holz 100 - Wood Fibre System

Wood Fibre insulation systems are highly breathable and vapour permeable; they are therefore ideal for use with Therma Holz 100 Blocks. This is a dry-fix system using Metal Pin Fixings to secure the insulation to the substrate for a stable and secure finish. Where breathability is essential in timber constructions, EWI Pro Wood Fibre insulation systems are especially reliable.