In this study the weathering damage of rafters are classified as five categories under visual inspection, and for each category both axial and flexural rigidity are evaluated so as to establish criteria for decision making whether the rafters could be reused or not according to the level of weathering damage. For each category of rafters, axial load bearing test and flexural bending test are performed to acquire both axial and flexural elastic modulus. Along with these tests, sectional area and second moment of inertia for the remaining undamaged section are calculated to evaluate both axial and flexural rigidity. The B level - slightly damaged level - rafters still retain flexural rigidity of 3/4 degree and can be reused partially for the rafters. Meanwhile, though the C level rafters can not be reused as rafters but still retain axial rigidity of 2/3 degree and can be reused as axial member. The D and E level rafters can not be reused not only as rafters but also as axial member.