The researchers studied how different humidity levels affect the durability of finger-jointed woods made from Sitka spruce. They found that the creep performance of the woods varied depending on the humidity conditions, with the greatest deformation seen at 85% relative humidity. The type of adhesive used did not significantly impact the creep amount. Woods with larger finger pitch showed greater creep deformation. Overall, the creep deformation was smaller in woods with air-dry moisture content compared to those with very low moisture content.