Garden shed series keter factor floor area 347 m width base dimensions 178 cm depth base dimensions 196 cm internal dimensions 162 x 182 cm firsthhe 208 cm eaves height 187 cm wall thickness 16 mm number of rooms 1 room size 59 m material plastic surface natural untreated colour brown roof shape saddle apex roof roof thickness 16 mm horizontal roof dimensions 178 x 1955 cm roof area 349 m roof overhang front 025 cm roof overhan