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Wall Panel Construction

(inside to outside)

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  • Airtight layer (15mm Egger OSB top)

  • EcoBox Studs - 200mm

  • Woodfibre Insulation - Air Injected.

  • Breathable External Sheathing (15mm Egger DHF)

  • Breather Membrane

  • Overall Buildup Thickness - 230mm 

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U-Value = 0.18 W/(m2K)

Cross-section of a 200mm Ecobox Timber Frame Casette Panel

200mm Ecobox 

Section Detail 

Cross Section through typical construction buildup 

The 200mm EcoBox wall system is a highly efficient timber frame solution that offers an excellent balance between thermal performance, buildability and material efficiency. Built around the engineered EcoBox stud, the system combines structure and insulation within a single coordinated assembly, reducing thermal bridging and improving overall wall performance compared to conventional solid timber stud construction.

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The increased depth of the structural zone allows greater levels of insulation to be incorporated within the panel, improving thermal performance while maintaining a simple and robust wall build-up. This enables the majority of the insulation to be contained within the timber frame itself, reducing reliance on additional insulation layers and simplifying construction on site.

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When specified with blown woodfibre insulation, the 200mm EcoBox system can achieve U-values of approximately 0.18 W/m²K, comfortably exceeding the performance requirements of the notional dwelling under Approved Document Part L. This provides designers and clients with a straightforward route to compliance while delivering lower energy demand, improved comfort and enhanced long-term building performance.

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Technical drawing of a 200mm Ecobox Timber Frame Casette Panel
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