How thick does insulation need to be for passive house standard?

For passive house standard (U-value 0.10–0.12 W/m²·K), typical insulation thicknesses are: mineral wool 300–350 mm total; wood fibre 320–380 mm total; cellulose 300–350 mm total; PIR 180–220 mm total. This is typically achieved with a combination of between-stud insulation (140–200 mm) plus external insulation (80–150 mm) plus internal service void insulation (50 mm).

For passive house standard (U-value 0.10–0.12 W/m²·K), typical insulation thicknesses are: mineral wool 300–350 mm total; wood fibre 320–380 mm total; cellulose 300–350 mm total; PIR 180–220 mm total. This is typically achieved with a combination of between-stud insulation (140–200 mm) plus external insulation (80–150 mm) plus internal service void insulation (50 mm). The total wall thickness for a passive house timber frame is typically 350–450 mm including all layers.

Why this matters

This question relates to Insulation for Timber Frame Homes: Materials & Performance Comparison, which covers the broader topic in detail. Understanding this specific aspect helps architects, builders, and timber dealers make informed specification decisions.

For full context and additional technical detail, see our comprehensive guide:

→ Insulation for Timber Frame Homes: Materials & Performance Comparison

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About this answer

This answer is part of the PuurModulair Knowledge Base — comprehensive timber specification guidance for architects, builders, and dealers across the UK, EU, and Scandinavia.