A fixing pattern describes the arrangement of the storm clips in the roof areas that require anchorage. If clipping is needed and you have selected a suitable storm clip, it is not enough to just randomly secure the tiles. The roof area requires full-surface anchorage. This is achieved by clipping each tile, or every second or third tile in a row (and in all rows diagonally offset).
Tests have indicated that, in most cases, the clipping of every second tile with a sidelock clip produces considerably better results than if the head of each tile is mechanically fixed.
In special cases, the layout pattern will need to be customised to accommodate specific roofing materials.
Mortar bedding without mechanically fixing the tile will not provide the required wind uplift protection.
Regulations for securing tiles, slates, shingles and shakes may vary from country to country following the National Annex of EN 1991-1-4/NA.