Looking Good !!! Its funny how most of us get this once we are wrenching slower and with less volume.
Nice Building! 4" should be fine if you're using it for passenger cars and pickups. If you're planning on putting heavy equipment in there, you might want to increas to 5". Either way, I would recommend installing 1/2" rebar matt on 2ft. centers each direction. And like Briz mentioned, if you know where your lift posts will be located, thicken those areas to 6" to 8", about 2ft square area.
The power company is finally hooking up my electric Monday. Typically with new services, I am responsible for running the conduit to the pole or transformer, and they will run the wire through there to connect on both sides. Well, the second electric service on a residential property is different. I was on the hook to buy the wire and stuff it myself. I had to buy 220' of 0000 gauge wire (3 conductors) at $2.50 a foot. Thankfully, I was smart enough to run the conduits with the bells all facing one direction, even the sweeps. That made it easy to stuff the wire through the 170' of conduit. Yesterday I got the call that they'll be here Monday to hook it up and install the meter in the base. So, yesterday I took advantage of Menards' 11% off sale and bought a bunch of romex, junction boxes, receptacles, switches, wire nuts, etc...so I could get some interior wiring done. I got about halfway through the receptacle install when the rain came...then the tornado warning. I figured it was time to quit then.
Garage door gets installed Wednesday, ceiling is going up this week, lighting goes up as soon as the ceiling is done, electric company is out tomorrow to hook me up to the grid, and I'll finish up other electric rough-ins this week sometime. I might be just a little excited Too bad I won't have concrete until this Spring...
Just had to cut a big assed hole into my "new" floor. Actually its 3 years old but that part has never had anything on it to date. I roughed in plumbing for a toilet and sink in one corner. Plans change over the years as to where the fixtures and walls would go. Sooooooo cut, hammer ,chisel and dig 2' down. reroute the pipes and then fill n concrete.