Thickness of the insulation board of the outer wall

In the southern region, the thickness of the outer wall insulation board is usually 30 to 50 mm.
In the northern region, the thickness of the outer wall insulation board is usually 50 to 100 mm.
For projects with high energy saving requirements, it can use insulation board more than 12cm.
In areas where we have a mild climate, you can use 5 to 8 cm insulation board.
In addition, the thickness of the insulation board will also be different according to the materials used, such as XPS (extrusion board), EPS (polybina), stone wool board, etc. These materials have their own standard thickness range.