Both bids specify 4" of 4000# concrete, finished and sealed, with sawed control joints. One bid specifies 6x6 6 ga. wire reinforcement, the other specifies 3/8" rebar 3' on center. Would one be preferable to the other? Is 4" enough thickness, for a residential driveway? I'm in Indiana, so winters almost always have a couple of periods where the lows are below zero.
Existing driveway is gravel, depth unknown, about 5-6 years old. Getting pretty weedy.
The bids vary a lot, one being $4.60/sq ft the other about $3.10.
Anything else to consider, or ask for clarification on? Neither bid mentions much about excavation and sub-grade prep, though it was discussed verbally with both contractors.