My parents had a garage, roughly 12 x 20 with a wooden floor on the property that I grew up in. The garage was likely built in the early 50's and my father, with the help of some buddies, logs as rollers, and a tow truck, moved the garage across town and onto our property in the late 60's. The "foundation" were logs, probably spruce that were milled flat on the top and bottom. The finished height of these logs was around 10 or 12 inches if I recall. I don't remember the spacing, probably every couple feet. As far as I know the logs sat on the ground. The floor were spruce planks, full 2 inch thick and likely 8 or 10 inches wide. They were never painted. There was a ramp, also made of wood which led up and into the garage. This type of garage construction was fairly common in the town I grew up in. Over the years, my father parked the Strato Chief, Impala, Ford LTD and Olsmobile in the garage. There were no machine tools in there, the garage's purpose was to park vehicles and for a bit of storage. My parents sold the place in the mid 80's. The garage still stands, with new siding it looks better then when we lived there. I have no idea what sort of maintenance, if any, has been done to the floor or the foundation logs, since we left.