I am just starting to install some 12″ hardie lap siding. Standard product specs call for bailing at 3/4-1″ from top edge in a blind nailing situation. This is for standard product and for 12″ there is no special instructions. There is no nail line on this product. I think it should be min 1″ and lap to 1.25,or 1.5″. Given the widht of the board it has a tendency to be kind of loose at the bottom edge since the nail doesn’t put much tension on the lap. I am wondering if we should add a face nail on bottom lap at perhaps a 6 ft interval or so and use a finishing nail hand nailed to prevent over nailing on this exposed edge. Any experience out there with this, let me know. Thanks