Laplock fixings can be used when securing overlaps from rooflight to either steel or fibre cement roofing sheets. Laplocks can also be used to stitch some fibre cement accessories to the sheeting in situations where you are unable to pick up on the main supports The fixing point must be pre-drilled before inserting the laplock into the hole, when you tighten the 8mm hex head on the laplock the rubber sleeve around the shaft of the fixing expands, giving a firm and watertight fixing point.