I've got my floor "half" installed already. No glue, or nailing, purely floating. We've got a foam underlayment and are using spacers. I'm noticing some trouble with the boards coming loose, gaps appearing between some of the boards. I'm wondering if the first row needs to be secured to the sub-floor (plywood over 6" planks) somehow. I'm really hoping that I don't have to pull up that first row, as that "row" is a bit not row-like, we have a great-room: living, dining and kitchen.
What can I do to tighten this up, without compromising the "breathing" of the floor, so as to avoid buckling etc?