That’s a good price for that work Jason. Guilderlan really has a limit on the size of the slab. Seems surprising for them to have such a thing. Or is that just in that particular area of guilderland?
IIRC my 24x48 slab was $6400 in just the mix. We dug it out, brought in and leveled/tamped ~80-100 tons of crushed stone(had to bring up one end almost 18" to level), and built the form for the pour. Also had a second pour the next day for the full length apron but I don’t remember what that cost… Insanely labor intensive. Hats off to the guys that do it for a living, they deserve what they charge for the work.
I still wouldn’t go with anything less than 6", but that’s just my opinion. I went with such a thick floor here at the shop because I had to have it support 5ton+ machines with heavy vibration. More floor = more vibration dampening. You can certainly do a step pour with different thicknesses, my dads garage has that(8" main, 4" side)
Also you don’t need to go stupid nuts with rebar. 4x4x.25" wire screen(wire that’s .25" in diameter welded on 4" square) is more than adequate. Even the 6" that Jason used is adequate. Around the edges is where you will want to add in some round rebar to provide support for the actual building footers. Big thing is to just make sure it is suspended in the mix and not pressed to the bottom of the floor.
If you’re going to do the labor work yourself leading up to the pour, there’s plenty of docs at the stores and online on exactly what you need to do to get it done right
I would like to in order to keep cost down, but I’m 2.5 hours away from the family so getting enough help would be a major problem. So I’m bidding it out, we’ll have to see what they say. I really want the basic building up by the end of this summer.