When choosing which length you would need for your 18mm skirting boards, we recommend the larger length if you have long walls and large rooms. This would keep the number of joins to a minimum.
If you choose the 3050mm lengths, you will be purchasing MDF skirting boards. If you choose the 4200mm lengths, you will be purchasing HDF skirting boards. HDF is a far superior material to MDF and is also mositure resistant!