It depends on what kind of damage is done to the existing driveway. If it has sunk in some places and there are lots of holes in it, it is probably because you don't have sufficient base material (gravel) under it. Or you could just have bad soils conditions. Anyway, if the surface of the driveway is still relatively flat, without any big holes in it, then resurfacing will work. If it is cracked, sinking or uneven, you need to have it redone, as the same problems will occur in a few years if you just have it resurfaced. So, if you need to get it redone, make sure that you have sufficient gravel under the paving (you shouldn't have less than 200 mm under the paving). If the existing gravel thickness is 200 mm, then bump it up another 100 mm or so. Have them provide minimum 65 mm thick asphalt paving (City of Calgary Mix type "B").
Another thing is, if you are parking anything heavier than a normal pick up truck or car on it, you may need more gravel (minimum 300 mm thickness) under the paving and have the paving at least 75 mm thick.
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