In order to establish the method for evaluating the checking of Sugi posts, checks on exposed posts were examined. Checks on Sugi posts exposed for 18 months were superficially inspected, that is, the length, width, and depth of the checks were measured from the outside with a ruler and 0.1 mm thick feeler gauge. Then, each post was cut into cross sections of the 30 mm width, and the check depth was measured accurately on each section. As visualizing check depths of a series of cross sections by graphic expression, the shapes of many checks were trapezoidal rather than triangular. The correlation between superficial inspection results and sectional inspection result were discussed, and it is considered that the gauge feeling is an accurate non-destructive method to measure the maximum of check depth, and the width and length can be applied to practical indexes to estimate the depth and inner area of check in Sugi posts.

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