Garden shed series palram skylight floor area 428 m width base dimensions 185 cm depth base dimensions 230 cm internal dimensions 170 5 x 221 cm firsthhe 217 cm eaves height 174 cm wall thickness 1 mm number of rooms 1 material plastic roof shape saddle apex roof roof thickness 09 mm roof overhang front 5 cm roof overhang side 5 cm roof overhang rear 5 cm max snowload 075 knm door type double door number of doors 1 door door siz