When stapling nailing down you only have the fastener holding the edge of the board down.
Face nailing needed for 12 inch wide plank floor.
Extremely wide boards 8 to 12 inches wide require three nails instead and boards under 4 inches use one nail.
On 10 and 12 wide planks use 3 nails per row.
It just depends on how narrow you indoor humidly range is.
As this prevents the hardwood floor from expanding.
A 4 wide plank is still begging to be face pegged as i mentioned also in the article.
In renovation work most product is staple nail down over wood subfloors.
When installing solid wide plank floors over a plywood subfloor the best method is to apply adhesive to the floorboards blind nail the length of the boards with a pneumatic nailer and face nail when you reach the end of a board.
Installation of wide plank flooring nail down installation of wide plank solid and wide plank engineered flooring requires additional bonding to the subfloor to prevent movement and squeaks.
This is done by introducing glue to the nailing process.
Regardless if installing a 3 wide engineered hardwood or a 5 wide engineered hardwood plank you are not using any more fasteners despite the increased width.
On 8 wide boards you may choose either 2 or 3 nails per row.
Which works very well with plank flooring to.
So if all this sounds like too much work just buy the standard 3 1 4 wide t g strip floor and blind nail it simply and easily with the flooring nailer.
Entails using adhesive in addition to nails even if you re installing a solid wide plank floor.