Correcting Pilodyn Measurement of Douglas-Fir for Different Moisture Levels

The objectives of this study were to examine the relationship between Pilodyn pin penetration and different moisture levels in Douglas-fir and to establish a standard sampling depth for estimating wood moisture content (MC) with a moisture meter. Data were analyzed by regression of Pilodyn pin penetration and MC in two moisture ranges (6 percent to 30 percent and > 30 percent). Results showed that pin penetration had a linear relationship with MC below 30 percent but was not significantly affected by MC above 30 percent. Pin penetration increased 0.26 mm and 0.19 mm for the 18- and 6-J Pilodyn, respectively, for each percent increase in MC up to fiber saturation. Average MC of the wood corresponded closely (r = 0.99) to MC 1.25 cm from the surface.

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