Robinia decking joists

Robinia — Robinia pseudoacacia L.

black locust, false acacia, acacia. Known as robinia in the timber trade.

Romania – traceability via SUMAL; EUDR documents provided

Planed 4 sides

Moisture: 12 %

High-strength finger joints (C4 exterior glue)

Density: 0.70 to 0.90 t/m³ depending on moisture

Yellow-brown hue

High-strength hardwood

Validated mechanical strength (EN 408 / EN 338 / EN 15497)

Small defects allowed (sub-structure use)

No sapwood

Widths: 60 to 100 mm

Thicknesses: 45 to 200 mm

Standard sections: 45×60, 45×70, 45×90 and 90×90 mm

Standard length: 6 m

Store on pallets, boards tightly packed; keep strapping until installation. Loose storage causes bowing of the pieces. Slight longitudinal bowing during storage is a normal feature of finger-jointed robinia for outdoor use (industry standard): it does not affect the integrity or strength of the finger joints (C4 exterior glue, tested to DIN 68140 / EN 385). Moisture must be checked on unloading; a later measurement is not representative of the condition on delivery. The moisture content then changes with ambient conditions (natural shrinkage and swelling), without affecting joint performance.

Class 4 (standard EN 335)

Non-impregnable wood, untreated

Service life up to 30 years depending on exposure

Natural greying – colour variation – possible surface cracking.

No maintenance required – no treatment needed.