The spacing of the sections is precisely matched to the special height. Ribbed doors are available single- skinned as well as double- skinned for high stability and good thermal insulation. The arrangement of the panels is individually calculated for each door size. That's why an absolute even spacing between the panels and from the panel to the edges is guaranteed Post-treatment of the timber with a wood preservative to protect it from UV rays, thereby helping to retain its beautiful appearance, is essential. On this robust surface structured with authentic sawn timber look, minor scratchier can be repaired without leaving any visible sign of damage. Moreover, is can also give a long protection against the rust.