When laying the boards, dont forget the old rule about which side is up on a board....look at the curvature of the grain at the end of the board. Lay the board so that the grain is a frown instead of a smile......i.e., so it doesnt hold water in the curvature. This makes the board last much longer. Also, pry or clamp the boards tightly together so when they shrink, you have minimized the gaps......