An approximate analytical solution on wind resistance performance for seam welded membrane, which is made of 0.4mm thick titanium sheets, is developed by using the method of applying a catenary on the curved line representing floating up height of membrane due to wind pressure. It is verified, by means of water pressure test and finite element method, that the result of this solution is sufficiently accurate. As a result of this solution, the floating up hight and the peal stress of weld zone of titanium membrane for waterproofing roof construction can easily be evaluated.
