First inspection of remedial treatments on the Howe Truss Railway Bridge, Waikino

Sections of the Howe truss railway bridge at Waikino that had been treated with preservatives were inspected after approximately 12 months. There were minor colour changes, particularly where CD50 and Busan 30L had been applied to the surface. CD50 was the only surface treatment which was still water-repellent. Of the preservatives which had been inserted into holes bored in the stringers, the Busan Pole Gel had largely disappeared but the CN emulsion and the Impel rods had only gone where there were shakes or major voids in the wood. The inserted preservative reservoir holes were replenished and resealed.