The number of screws results from the panel layout, supports and loads. The same square metreage may require a different number of fastenings at the edge of the building than in its central part. A rate per metre is only useful once the whole layout has been calculated. It should not replace drawing out the locations where the fasteners are to work. Gather the panel laying plan and the support layout. The panel lengths, cladding thickness and type of structure are needed. Also check the method of fixing: visible or intended as concealed in the joint. Not every system uses the same detail.

The longest available panel is not always the best choice. It has to be delivered, lifted and supported on suitable supports. Shorter sections can make logistics easier but create additional joints. The length should therefore be determined together with the cladding design and installation plan before the final order is placed. The production range indicates which elements can be made within a given family. It is not, however, a table of permissible spans. A long panel may still require several supports. Their spacing depends on the loads and the parameters of the specific variant.