What loading should be applied to timber roof structures?

Timber roof loading comprises: dead load (self-weight of timber, tiles/slates, battens, felt, insulation, ceiling — typically 0.5–1.2 kN/m²), imposed load (snow per EN 1991-1-3 based on altitude and zone — 0.3–2.0 kN/m² in most of Europe, plus maintenance access 0.6 kN/m² minimum), and wind load (uplift and pressure per EN 1991-1-4 based on location, height, and roof pitch). Wind uplift often governs connection design, particularly for lightweight roofing materials.

Timber roof loading comprises: dead load (self-weight of timber, tiles/slates, battens, felt, insulation, ceiling — typically 0.5–1.2 kN/m²), imposed load (snow per EN 1991-1-3 based on altitude and zone — 0.3–2.0 kN/m² in most of Europe, plus maintenance access 0.6 kN/m² minimum), and wind load (uplift and pressure per EN 1991-1-4 based on location, height, and roof pitch). Wind uplift often governs connection design, particularly for lightweight roofing materials.

Why this matters

This question relates to Timber Roof Structures: Trusses, Rafters & Engineered Solutions, 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:

→ Timber Roof Structures: Trusses, Rafters & Engineered Solutions

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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.