EL

I have the foundation built and now will be topping it with pressure treated lumber. I have read several different ideas:

1. No spaces between boards. They will shrink more that non PT lumber
2. Wait anywhere from 1 month to 1 year before sealing PT lumber.

Do any of you have experience with PT lumber? I was looking at Thompsonized PT lumber, it is a few $ more but looks less green or wet.

Any advice or ideas is greatly appreciated.