Garden shed series keter factor floor area 8 m width base dimensions 256 cm depth base dimensions 331 cm internal dimensions 236 x 311 cm firsthhe 243 cm eaves height 187 cm wall thickness 16 mm number of rooms 1 room size 155 m material plastic colour grey roof shape saddle apex roof roof thickness 30 mm door type double door number of doors 1 door door size h x w 138 x 191 cm number of windows 2 base structure with floor