Prebuilt exterior room

A prebuilt transportable module providing a room to be secured externally to the wall of an existing building, said room having front and rear walls, left and right sidewalls, a ceiling and a floor, said module comprising a sandwich type floor member, said floor member having a rectangular framework of front and rear joists and transverse joists including end joists extending between the front and rear joists, said floor member having plywood panels covering the top and the bottom of the rectangular frame work and rigidly secured to the joists, said module also comprising vertical front wall and rear wall and sidewall members each including vertical inner wall forming plywood panels having bottom portions overlapping and rigidly secured to sides of said front and rear joists of said floor member and the end transverse joists of said floor member, said module further comprising a roof member having a rectangular framework of front and rear joists and transverse joists including end joists extending between the front and rear joists, said roof member having a plywood panel covering the top of said framework and rigidly secured thereto, said vertical inner wall forming panels having upper portions overlapping and rigidly secured to sides of the front and rear and end transverse joists of said roof member, said vertical inner wall forming panels extending substantially the full heigh of the module and forming an inner box strengthened at opposite ends by rigid attachment of said bottom portions and said upper portions respectively to said floor member and said roof member, said vertical members including vertical risers rigidly secured to the outside surfaces of said vertical inner wall forming panels, and outer enclosure forming sheets rigidly secured to said risers to form an outer box around and rigidly connected to the inner box, said sheets being structural load carrying elements, means rigidly interconnecting said sheets to said roof member and to said floor member, said boxes and the respective vertical inner wall forming panels and enclosure sheets thereof carrying loads on the module and providing strength and sturdiness with torsional rigidity in all three planes for the module.