Before I start getting Congtractors in, would like to ask all of you
experts: For a typical home driveway re-do:
What should the depth of the gravel beneath the asphalt that the
Contractor should/will put down be ?
What depth of Asphalt on top would make a good job ?
I'm no expert but had mine repaved this spring.
Contractor only removed parts of old asphalt that were badly cracked and
might read through new paving. He only added a little gravel to those
spots, about equivalent to asphalt removed. I did have it widened by 2
feet but don't recall depth of gravel.
I'm not so sure about the base, but I've hear of anywhere from 4" to 12".
Depends on the soil too.
As for the coating, it is generally a 2" thick coarse basecoat and a finer
2" top coat.
Be sure the contractor specifies what he is to put down and be sure to take
a peek as he is putting it down. You can get away with less, but it will
start to show wear in a few years, especially if you have heavy traffic.
It also depends heavily on where you live (winter? hot summer? water
table?) and what kind of base you have underneath (clay? sand? ledge?
A good local contractor will know the area and take a look at your
particular place and figure it out. Get a couple of contractors and
look at the ones that agree on prep.
Why not ask your County Engineer what the spec is for lesser used
roads? Probably a driveway wold be pretty durable at some fraction of
that, say 80%. He may also have useful comments about substrate
preparation, like what size and depth of gravel in your area would
provide the ideal drainage.
In any event, you will need permits for the project, and there may
also be specs required to be attached to that request. Its much easier
if you get to right the first time out.
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