I would like to install a subfloor in my garage and turn it into an office. The floor is slanted all towards the middle where there is a drain. There has never been any water (that I've seen in the last 5 years anyway) come out of it. However, sometimes, when it rains VERY HARD there is a little bit of water infiltration beneath my garage door.
My question is - Can I build a sub floor over top of that? Do i need to leave access to the drain? should i be worried about the minimal water infiltration (we're talking about 2-3 cups of water)