A quick note on spacing:
MOST of the claims I'm called out on revolve around decks that had been spaced when they shouldn't have. Each case really is different. On decking with high moisture content (freshly treated), it's a good idea to butt the pieces up (as homebild recommended). On decking that hasn't been freshly treated and has close to equilibrium moisture content (that of your surroundings), then it should be spaced.
There's no hard and fast rule to this- it's all about moisture content. When we treat lumber, we can swell it as much as 8 to 10 percent. Now that CCA is history, we don't have to let freshly treated lumber languish on drip pads waiting for fixation to occur. That means that lumber yards who traditionally keep low inventories often have lots of PT around that is freshly treated and of high moisture content. The old rules don't apply anymore.
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