They might cup after this fastner but I don't think so...

http://www.porta-nails.com/index.shtml

and these:

http://www.porta-nails.com/nails/index.shtml


John wrote:

I'm soon going to be installing wide red pine flooring in widths from 6 to
12 inches and want to take any and all precautions to stop any cupping from
occuring later on. Right now, the boards are acclimitising stacked and
stickered. They are prefectly flat.