1  Asphalt Shingle Roofs

2  Tile & Clay Roofs

3  Sheet Metal Roof

             Problems :

Conventional Roofs are all limited only

          1  Rain Proof

          2  Thermal preserving

1  Asphalt shingle roofs

                             2  Tile & Clay Roofs

                                     Problems :

   Poor Thermal Insulation

   Too Hot in Summer , Too Cold in Winter

   Too Heavy !

   Only 2 Features : Rain Proof & Thermal preserving

                                Problems :

Short life, Need to replace every 10 years.

Only 2 Features : Rain Proof & Thermal preserving

Overview on Common Building Roofs