The material

Why a 6-8 cm round stake rots in 3 to 10 years, what sapwood really changes, and which cut to choose for each use: round, sawn, split or square.

EN 350 durability class 1-2, trials in Belgium, Germany and New Zealand, and our experience: how long a robinia stake really lasts, and why.

≈ 18 GJ/t oven-dry, 14.4 GJ/t net at 20 %, long embers, fast seasoning, and why it burns even fresh: robinia (acacia) as firewood.

Robinia's greying is a patina less than half a millimetre deep: durability is unaffected. Decking oil, wood reviver, cleaning — and what is pointless.

Acidic (pH 4.5), dense (0.70–0.90 t/m³) timber: A2/A4 stainless or C4-coated hardened steel, pilot holes at 70 % of diameter, through bolts. Sizes and spacings.

Robinia is Europe’s most durable outdoor timber: use class 4 without treatment, up to 30 years in the ground. Figures, limits and uses.

Contents of the Acacia Poles Robinia series: 28 articles and 137 frequently asked questions on robinia outdoors — durability, installation, farming, councils, traceability.