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Old 2018-02-17, 10:19 PM
condor11 condor11 is offline
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Default New asphalt driveway - plan for having a second layer

We are getting quotes for putting a new asphalt driveway in our new construction house. It's a 3+ car wide driveway and 2 cars long, so quite big.
One contractor suggested instead of doing normal single coat do put a "binder coat" which is basically same thickness layer but will sit a few inches lower. And then in a few years after it all settles and gets all wavy we'll just need to put a second coat on top. He says pretty much all first time asphalt driveways will settle and have depressions by 5 year mark.

It will surely cost more in the end but we'll save on having the old layer ripped and in the end will end up with thicker overall structure.

Anyone ever done that?
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Old 2018-02-18, 01:35 PM
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good2know good2know is offline
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Location: Ottawa
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A properly installed driveway base will not sink and settle and turn wavy in 5 years.

A contractor that thinks this makes me very nervous.

I don't understand how he plans to install it 'lower'. You need a slope flush with garage floor and the top of the curb. Any dip in the middle will collect water.

I am aware of one recoat experience. A neighbours driveway did sink and settle. The repair was to repave over the top of what was there. It looked fine initially but it did continue to sink slowly over time.
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Old 2018-02-20, 11:14 AM
BartBandy BartBandy is offline
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Asphalt is not structural. No thickness of asphalt will span anything.

New builds, especially in subdivisions, never have properly compacted driveways, and they are usually a few inches of crushed stone mixed with organics and other compressible materials that are tracked in from tires and other work going on. It's true that the best way to deal with that is to put down a base coat of asphalt, about 1" lower than finished grade, and wait for settlement to occur. But it may never stop moving. Especially near the house where there is 4 feet of backfill around the foundation. Ours hasn't, and it's been 7 years.

At some point, I envision tearing up our driveway, excavating down, and using crusher run to create a proper sub base. Then we will look at pavers. You can't put any amount of asphalt over a bad sub base, at any intervals, and expect it to not heave or move. You have to get the sub base right first. Depending on the area, that can mean 18" of excavation, but it's the only way.

Last edited by BartBandy; 2018-02-20 at 11:18 AM.
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