Yes, Almost every project will get cracks. That stems from the ground freezing and thawing during the seasons in MN. All cracks can be fixed! We recommend after the 1st year of blacktopping to have a professional seal coat and crack fill company to come in a fix all cracks and get the driveway seal coated. NOTE: Seal coating is only preventative maintenance NOT corrective. If anyone has a leaky vehicle, if gasoline or any vehicle fluids are spilled on the driveway it could cause damage.
Sidewalks, aprons, patios, garages, and basements are recommended to be 4" or more. driveways are recommended to be 4+". Slabs that have heavy machinery parked 5" are recommended.
Yes, the cracks help when the concrete cracks hopefully it will crack in those spaces. Now how many depends on the slabs thickness and area space. If the slab is at 4" in depth it's recommended to cut your joints approximately 5-8 feet apart. Most cities have ordinances that require certain cuts so many feet apart so check with your city or township. Another way to prevent cracking is to add fiber mesh to the concrete when pouring. Fiber holds the concrete together at its most vulnerable point in the curing process.
ABSOLUTELY, its highly recommended! We sell and use an excellent producer of commercial grade of sealing products. Sealing helps prevent scaling and popping of the concrete.