Floor nailing
Boards up to 85 mm cover width need to be fixed by face-nailing with one or two nails or be secret-nailed with one nail at each joist.
Boards over 85 mm cover width must be fixed with two nails at each joist.
Alternate nails in double-nailed boards are to be skewed slightly to the vertical, in opposing directions. The minimum edge distance for nailing at butt joints or board ends is 12 mm.
All nails, including machine-driven nails, should be punched a minimum of 3 mm below the top surface. Nail punching should allow for sanding and finishing and for drawing boards tightly onto joists.
Pre-drilling boards for fixings at butt ends helps reduce splitting.