Laid 2200 sq/ft in 4 days between Cristmas and New Years. Took Mark Gillis's advise and had someone drill out the pre-drilled holes as they don't go all the way thru for the spikes. That saved alot of pounding. The space between tongues is wide enough that you can drive the spikes home with a hammer and not smash the tongues. Those 8" spikes are necessary because you can't pry the 3x6 to marry-up with it's neighbour, too damn beefy. The spikes draw it together nice. Used 4" GRK's everywhere else. Butt joints were cut square at a ever-so-slight angle so the visible joint was tight with a 1/8" gap on the top side. All in all it went well but I wouldn't want to lay 3x6 again any time soon.
