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Applying Render to Thoma Holz 100

This week in our ‘applying render to’ blog series, we’re discussing the best method for applying render to a Thoma Holz 100 construction.

Thoma Holz 100 is a solid wood building material that combines modern building technologies with the traditional; it creates an eco friendly, natural and sustainable construction that offers numerous benefits, some of which include:

  • Breathability and airtightness
  • Fire safety
  • Soundproofing
  • Quick assembly time
  • Eco-friendly (sustainable timber)
  • Excellent indoor air quality
  • Naturally high thermal performance

Thoma Holz 100 is a truly high performance building material, and the wood effect is definitely a pleasing look. However, if you wanted to mix it up a bit then applying render to Thoma Holz 100 is very easy.

How to Render Thoma Holz 100

The only downside to using solid wood construction is that wet, cementitious materials are unsuitable for application directly onto the surface of the wood. This is because Thoma Holz 100 is a dry construction, so any water within the render materials can be absorbed into the wood, thereby affecting the structure. Instead, the solution is to install either render carrier board (which is a bit of a pain to fix) or Wood Fibre insulation on top of the Thoma Holz 100, before finally applying the render!

The benefit of using Wood Fibre instead of render carrier board is that it has excellent thermal properties, improving the performance of the building but also complimenting the structure. Timber blocks and timber insulation boards work well together – no? The Wood Fibre insulation boards that we offer are also extremely sustainable (they’re by Pavatex and are NaturePlus certified!), so if maintaining sustainability is a concern then Wood Fibre is the way to go.

To secure the Wood Fibre insulation to the Thoma Holz 100, simply use stainless steel wood screws with universal fixing discs – no adhesive should be used as this is a dry-fix system. The Wood Fibre boards lock together, so the risk of thermal bridging is thoroughly reduced; they’re also really breathable and therefore will not hinder the breathability of the Thoma Holz 100.

Once the insulation boards have been applied, the Premium Basecoat should be applied directly on top of the insulation boards, and a fibreglass mesh should be embedded within it. We recommend using a breathable thin coat render such as our Silicone Render, which needs to be applied on top of the Premium Basecoat once it has fully set. The render can be tinted to create any colour and comes in a range of grain sizes, so the design options are endless!

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