Compare
Two options. One context. A decision.
Set the two candidates and the climate they must survive. The table is data; the recommendation is reasoned.
- CrossrefResearchDOI registry
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- ERA5 / CopernicusClimateClimate reanalysis
- Open-MeteoClimateStation normals
- EN 350:2016StandardNatural durability
- EN 335StandardUse classes
- EN 351-1StandardPreservative penetration
- EN 16449StandardBiogenic carbon
- EN 1995-1-2StandardCharring rates
- EN 1990StandardDesign working life
- EN 13183-1StandardMoisture measurement
- EN 599-1StandardPreservative efficacy
- EN 16755StandardFire-retardant durability
- EN 14080StandardGlulam requirements
- EN 16351StandardCLT requirements
- EN 927-6StandardArtificial weathering
- EN 15026StandardHygrothermal simulation
- ISO 15686-8StandardService-life prediction
- ISO 21887StandardGlobal use classes
- EN 15804+A2LCADeclared environmental impacts
- Scheffer indexModelDecay hazard
- Lacy driving-rain indexModelFaçade exposure
Advanced comparisonEvery indexed property, any two species, any climate zone
In plain terms
In Coastal Scotland, the deciding factor is wind-driven rain and chloride load dominate. biological growth on north elevations within 24 months.. Read the service-life and maintenance rows first — everything below them only matters once those two are acceptable for Norway Spruce or Western Red Cedar.
| Attribute | Norway Spruce | Western Red Cedar |
|---|---|---|
| Latin name | Picea abies | Thuja plicata |
| Density | 450 kg/m³ | 370 kg/m³ |
| Bending strength | 80 N/mm² | 68 N/mm² |
| Dimensional stability | Moderate | Very high |
| EN 350 durability class | DC 4 (slightly durable) | DC 2 (durable) |
| Service life | 10–20 yrs treated, 5–10 untreated exposed | 40–60 yrs façade |
| Colour ageing | Yellow-warm → grey-silver in 18–36 months when exposed | Red-brown → soft silver-grey in 12–24 months |
| Fire | Euroclass D-s2,d0 · charring 0.65 mm/min | Euroclass D-s2,d0 · charring 0.67 mm/min |
| Carbon stored | 0.78 t CO₂e/m³ | 0.72 t CO₂e/m³ |
| Cost index | 38 | 100 |
Climate context: Coastal Scotland · Cfb — temperate oceanic · Wind-driven rain and chloride load dominate. Biological growth on north elevations within 24 months.
The whole index, filtered
12 species with EN 350 durability, density, stored carbon and a relative cost index. Filter to the shortlist that survives the brief, then send a candidate to option B.
| Compare | |||||
|---|---|---|---|---|---|
| Thermally Modified AshFraxinus excelsior (TMT) | DC 1–2 after modification | 620 kg/m³ | 0.88 t CO₂e/m³ | 86 | |
| Robinia (Black Locust)Robinia pseudoacacia | DC 1–2 (very durable) | 770 kg/m³ | 1.08 t CO₂e/m³ | 108 | |
| Acetylated Radiata PinePinus radiata (acetylated) | DC 1 (very durable) | 510 kg/m³ | 0.81 t CO₂e/m³ | 132 | |
| Iroko (FSC certified)Milicia excelsa | DC 1–2 (very durable) | 660 kg/m³ | 1.05 t CO₂e/m³ | 145 | |
| Thermally Modified PinePinus sylvestris (TMT) | DC 2–3 after modification (process dependent) | 480 kg/m³ | 0.79 t CO₂e/m³ | 64 | |
| Sweet ChestnutCastanea sativa | DC 2 (durable) | 560 kg/m³ | 0.94 t CO₂e/m³ | 78 | |
| Western Red CedarThuja plicata | DC 2 (durable) | 370 kg/m³ | 0.72 t CO₂e/m³ | 100 | |
| European OakQuercus robur | DC 2 (durable) | 720 kg/m³ | 1.02 t CO₂e/m³ | 118 | |
| Scots Pine (heartwood)Pinus sylvestris | DC 3–4 heartwood; sapwood DC 5 but treatable | 500 kg/m³ | 0.83 t CO₂e/m³ | 34 | |
| Douglas FirPseudotsuga menziesii | DC 3–4 (moderately to slightly durable) | 530 kg/m³ | 0.86 t CO₂e/m³ | 52 | |
| Siberian LarchLarix sibirica | DC 3 (moderately durable) | 590 kg/m³ | 0.95 t CO₂e/m³ | 58 | |
| Norway SprucePicea abies | DC 4 (slightly durable) | 450 kg/m³ | 0.78 t CO₂e/m³ | 38 |