I want to make one bay of our two car garage into a woodworking shop and leave the other for my wife’s car. Unfortunately, the concrete slab in the garage is pretty much level with no floor drain. I plan to insulate and heat the garage so I need to get rid of the water so I don’t have excess moisture rusting all my tools. I live in northern Connecticut so the water is primarily melted snow, maybe a gallon or two at a time.
I have three questions. 1. What is the best way to get the water to drain to one place? 2. Should this be a central floor drain or towards the door? (How does water sloped towards the door actually get out without letting lots of cold air in?) 3. Assuming a central drain, what is the best way to make it? I do not want to remove and replace the existing slab.
For the draining part I thought I could build up the floor in the one bay with concrete (or something else?), all sloped to the center but I don’t know how thick would this have to be so it doesn’t crack and/or flake off? Or would it be easier to use a concrete saw to cut a whole bunch of sloping channels towards the center?
For the actual drain, I was thinking of cutting about a 1 foot square in the middle of the floor, digging out was much as I can, and then filling it with gravel. Or maybe making a concrete well with a sump pump would be better.