Timber roof trusses have the lowest climate impact across all measured span lengths when compared to concrete, steel, and glulam options. A study conducted by Zeina Alasadi and Selma Bergström Denizoglu at Chalmers University of Technology, Sweden, shows that nail plate connected timber trusses consistently outperform other materials in reducing CO₂ emissions, even when more timber units are required to match the span coverage of a single truss made from concrete or steel. The analysis covered trusses with spans from 6 to 26 meters and focused exclusively on emissions from the production phase, using life cycle assessment (LCA) data corresponding to stages A1–A3. The timber trusses were evaluated using verified environmental product declarations (EPDs) from Derome, which supplied design specifications and material volumes. Timber trusses with spans of 6, 8, 12, and 20 meters generated CO₂ emissions of 59.72 kg, 78.5 kg, 145.15 kg, and 352.5 kg respectively when scaled to match standard center distances.