I left a about a half inch gap and ended up painting the concrete base the same color as the floor and then painted the floor about an inch in. You cant really see the gap this way. I was going to do trim but it really isn't noticeable.
So I've been reading this forum for a few years and finally decided on which type of flooring I was going with. I chose Race Deck and I have to say it is a wonderfully designed product. The fit and finish are well thought out. I did the majority of my 532 square foot garage in just 2.5 hours...