Garden shed fsc certified timber pad bolt styrene glazed windows roof floor area 99 m width base dimensions 310 cm depth base dimensions 320 cm firsthhe 260 cm dimensions in feet 10x10 ft material wood surface dip treated colour honey brown roof shape saddle apex roof roof cladding roofing felt door type double door number of doors 1 door type of glazing styrene number of windows 7 base structure with floor cladding style shiplap