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A Strong Asphalt Driveway

Asphalt or blacktop driveways are often the pavement one ends up with in a new home. They are typically the least expensive paved surface a builder can install. Just because they cost less money by no means are they inferior. In fact, a blacktop drive that is installed with great care can last for 30 or more years with little effort.

If you have ever watched a dropped glass shatter on an older blacktop surface you would probably testify that it was as hard as rock. In many respects you would be correct since the blacktop is a matrix of small rock chips, sand and asphalt cement. Many worn asphalt surfaces are anything but black. They almost always look a lighter shade of gray. The stone chips in the mix create this color. Look closely and you will see small amounts of black in between the stone chips and sand particles. This black is the actual asphalt that cements all of the stone chips and sand together.

But the real truth of the matter is that asphalt, even older asphalt surfaces, are flexible. Newer asphalt is far more flexible than an older surface because the asphalt still retains many of the lighter hydrocarbon oils that allow the asphalt cement to liquefy at oven temperatures where you would normally bake a cake. Put a piece of concrete in your oven at this same temperature and you will get a hot rock, not a puddle of smoking goo on the bottom of the oven.

A good gravel base beneath the asphalt is the secret to a long-lasting driveway.

A good gravel base beneath the asphalt is the secret to a long-lasting driveway.

Knowing this, the secret to getting a long-lasting asphalt driveway at your new house that can withstand even heavy truck traffic is the hidden gravel base beneath the smooth ebony surface you and I see as a finished product. The standard gravel base beneath an asphalt driveway serves as the foundation for the pavement. If you install 8 or 10 inches of crushed well-compacted gravel on solid soil, the blacktop finish has a great start at a service life of 30 or more years. If you don't believe me, come to Cincinnati and I will show you several 30 and even 40 year-old driveways that are still in good shape.


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Many asphalt paving contractors use crushed gravel because it is the least expensive foundation material. If you want the best underlayment for the blacktop you can have your builder install a deep-base asphalt driveway. This system uses a thick layer of asphalt with larger stones as the base layer. This system is so strong it has been used to build the roadbed under railroad tracks.

Wet soil and weak soil that breaks down in the presence of water can foul the gravel base beneath blacktop surfaces. When this happens, the gravel loses much of its internal strength. Geo-textile fabrics can be laid on top of the soil before gravel is placed. This fabric stops the movement of soil particles into the gravel. The textiles are durable and roll out onto the soil as you might unroll a throw rug.


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If you want your new blacktop driveway to look good for many years you need to make sure the gravel or deep-based asphalt base is one foot wider than the actual finished blacktop surface. All too often the asphalt contractors install the finished blacktop to the edge of the gravel. When visitors drive over the edge of the drive into the grass, they crack off one or two inches of blacktop because it has no support immediately at the edge. The extra six inches of gravel hidden beneath the grass provide this much-needed support.

Resist the temptation to seal your new asphalt driveway. Even under ideal curing conditions where the daytime temperatures are high and nighttime temperatures are balmy, asphalt needs a minimum of 90 days to fully cure and harden. Remember, this is the minimum amount of time. It is best to let your asphalt driveway cure for 6 or 9 months before you think of sealing it.

Sealing a new asphalt driveway before it's time is the kiss of death. The sealer locks in the light-weight hydrocarbon oils that give the asphalt its flexible nature. If this happens, your driveway will be permanently susceptible to imprints from bike kick stands, twisting tires and any concentrated load from a pointed object.

When you do seal the driveway, use a high-quality coal-tar based sealer. These typically should be applied every 3 to 5 years. The driveway should be sealed when either the original black asphalt has worn off the stones or the subsequent coat of sealer has worn off revealing the actual pieces of stone aggregate.

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10 Responses to A Strong Asphalt Driveway

  1. We had our drive resurfaced and it appears that some areas of the new asphalt are losing small stones, making the surface very rough. Is there a hot sealer that can be used to bind everything together?

  2. We just had our driveway top coated with 2 inches of compacted asphalt. The temperatures have been mid-90's and over since paving. I am concerned about driving and parking on the new asphalt.

    How much time would you allow before driving on your new investment?

    Thanks,

    Tim

  3. We are getting our driveway redone. The contractor said that he is leaving the old driveway in place and filling the "pot holes" with QP and will level it. Is this better than tearing out the old driveway completely?

    All the other estimates we got, the contractors all said the old driveway would come up.

    Which is the right/better way?

    Thank you.

  4. We are currently getting bids to replace our 30 year old asphalt driveway. Some of the contractors are saying that they need to remove the old asphalt and put down a new base and some are saying that it is not necessary to remove all of the asphalt, only the portion that has crumbled. Any advice you can give me would be greatly appreciated.

    Thanks

    • Jenny, your question requires lots of typing, plus I have some questions for you so I can give you the correct answer(s). I only do pithy answers here in the comment section. If you want to protect the investment you have in your house and not waste time or money *hoping* you make the right decision, you should talk to me on the phone for just 15 minutes. It'll be the best investment you've ever made in your home!

  5. Hi Tim,

    I have a 2200 sq ft blacktop driveway probably over 20 years old. A contractor said he would excavate and lay 5 inches of base with 2 inches of compacted FABC asphalt. What is FABC asphalt and is it good for the north east region?

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