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This study is basic study for establishing the proper construction method for the joints of EVA waterproof sheets,variety of construction temperature and hot wind fusion rate condition during the formation of the joint shall be applied to identify the tendency of quality change based on the tensile strength,and to propose the joint formation conditions for ensuring proper quality.According to the results of the testing,the tensile strength of the overlap area was the highest between the temperatures of 25 ℃,30 ℃ and 35 ℃ at 7-8 m/min,and between-10 ℃,-5 ℃ and 0 ℃ the tensile strength of the adhesion was highest when the welding speed was at 3-4 m/min.And it is expected that it can be used as basic data that can be used for making reasonable specification decisions to secure waterproof quality in the future.