5 inch is better, you are the one paying for it tho.
never heard of 3000 for such, 4000 or 5000 is what's used.
Never heard of 3 foot spacing; 1 foot is great, 2 foot is common for cost. 3 foot - why bother. Rebar is best in a floor, no more than 2 feet. Chairs are good, but then you can't wheelbarrow over the area, how you gonna pour? Without experienced folk, you gonna remember to pull the bar up as you go without chairs, or let it lay at the bottom....
Concrete cracks, cut it on 12 foot sections or so to control where the cracks happen.
Mesh likes to rust out where cracks happen, it likes to sink to the bottom of the pour and do nothing, it is kinda weak to hold a floor crack together.
Fiber is good to control surface spawling/ minor surface cracks, but won't hold a floor together. As well, some folks have issues with the fibers sticking out & scratching you as you kneel/ lay on the floor.
Solid tamped soild underlayer is most important. Do that right, period or the floor won't hold up no matter what you do.
Those here saying they have no cracks did the bottom surface right an well, and will see cracks some day - all concrete does. A shed my dad floored in the 1970's only 12x18, solid floor, last year asll of a sudden big crack through it, and offset 1/2 inch drop. Dad overbuilt stuff, but he didn't believe in wasting money on rebar. If he'd a done the rebar, the crack would hasppen, but the rebar would hold the floor from settling.
They all crack sometime, the rebar & cuts help you control that. Rebar needs to be close enough to bridge the problems that show up over the years.
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