A Mini Review of Roof Structure Technologies for Stadiums based on Cortical Layer

recently, with increasing of interest of all people especially young people and teenagers to sports in Iran in parallel the tendency of investors both in governmental and private parts is increased ,and in this part the special places and spaces of sport was not departed , and billion Rials (Iran’s currencies) is paid for making some places for sport or equipped the old building .In this part football stadium are very important , on the one hand , the grass of playground need water and light but the shade of sits of fans make some problems for the grass , but on the other hand , in Europe , in most stadium they have made roof for stadium and in some cases they are equipped with moving roof for making more comfortable place for roof .The aim of this research is the review of technology of making the roof in stadium .This research is the over viewing of present essay .Today’s it is used from cortical layer technology from material ETFE which is very useful for stadium because of special characteristics.