How long do timber palisades last in ground contact?

Service life varies dramatically with species and treatment: untreated softwood (pine, spruce) lasts 3–7 years in ground contact; pressure-treated softwood (UC4) lasts 15–25 years; European larch (untreated) lasts 10–15 years; European oak heartwood lasts 25–40 years; robinia/black locust lasts 30–50 years; and tropical hardwoods (ekki, greenheart) last 40–60+ years. The primary failure mode is fungal decay at the ground line where moisture and oxygen combine.

Service life varies dramatically with species and treatment: untreated softwood (pine, spruce) lasts 3–7 years in ground contact; pressure-treated softwood (UC4) lasts 15–25 years; European larch (untreated) lasts 10–15 years; European oak heartwood lasts 25–40 years; robinia/black locust lasts 30–50 years; and tropical hardwoods (ekki, greenheart) last 40–60+ years. The primary failure mode is fungal decay at the ground line where moisture and oxygen combine. Extending service life requires ensuring good drainage around the base and avoiding soil banking against the timber above ground level.

Why this matters

This question relates to Palisade & Landscape Timber: Design Guide for Garden Architects, 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:

→ Palisade & Landscape Timber: Design Guide for Garden Architects

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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. All technical content is reviewed by qualified timber technologists before publication.