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The joint systems have been mainly used overlap joints and mechanical fixation methods of sheet-membrane composite waterproofing methods on roof exposure waterproofing of structure. However, these methods have been frequently occurred damages at joints by contraction and thermal behavior of sheet. The area applied in this study is an exposed area of the rooftop, and stainless steel sheet was used in a preceding study to secure maximum specimen performance from tensile force, deformation and elastic force, where waterproofing sheets of a synthetic polymer system as an actual material for the complex waterproofing construction method were tested using identical conditions. Test pieces were divided into a total of 2 kinds consisting of a general form and a pierced form, and coating materials divided into a total of 2 kinds such as cross section coating and both side coating with application of 4 types in total including general form, general form, pierced form, pierced form. In this research, we find proper joint distance in butt joint of sheet-membrane composite waterproofing methods and select the stable joint type by tensile strength test at joints.