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The main purpose of this study is to investigate and evaluate the joint types of weathering steel details in exterior wall. Usually rust influence bad impact against steel. So proper treatments against rust are necessarily need in constructing buildings. But in case of weathering steel, rust(stabilized rust) rather protect steel and increase durability. The results of study are as follows;1. The color of rust on weathering steel surface is changed into dark-chocolate color, after setting up the sample model. And the difference of color by directions and parts is gradually reduced.2. The rust stains on the surface by rebounded rains are not removed. So exterior wall of weathering steel must part from the floor level, about 30cm.3. The joint types of weathering steel are divided into 'butt joint type', 'overlapped joint type', and 'folded joint type'. 4. In aspect of waterproof performance, 'overlapped joint type' is superior to any other joint type.