Insulated Garden Office/Log Cabin/Garden Room/Summer House 175mm wall thickness

Size of building is 2.5m high, 6m long, 3m wide not including canopy

Walls

12mm paintable board

100mm x 50mm stud

100mm earth wool insulation

11mm Osb structural board

Breathable membrane

25mm pressure treated timber

22mm pressure treated engineered external timber cladding

This gives you a total wall thickness of 170mm (7 inches)