The performance of fasteners in wooden constructions is an important aspect especially regarding corrosion resistance. In an early stage corrosion of fasteners in untreated timber becomes often visible as a discoloration on the surface of the timber resulting in bad appearance of the product followed by complaints. In order to develop an accelerated test for the assessment of fastener performance the suitability of six oak and larch test sets were exposed in greenhouse. Visual inspections revealed that discolorations occur in oak based sets in a very short time when fasteners were associated with artificial water traps. As expected minor discoloration occurs in larch test sets compared to oak. Nevertheless the results suggest that the setup “with water trap” could be a useful tool for fastener manufacturers to evaluate the performance fastener coatings in service.

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