Tired of your asphalt buckling?

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Now that the snow and ice have melted off your driveway, you will probably be surprised by the damage that was not there last fall. If your driveway could talk, it would say that it needs some repairs as well as regular care and maintenance.

In these northern states, buckling can be caused by frost heave in the spring or even from driving very heavy vehicles or machinery on the driveway repeatedly. CBS visits many sites where the asphalt has buckled as much as eight inches between winter freeze and spring time.

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Many times upon excavation of the driveways, we find that not only is the soil comprised of organic clay, but many times, eluvial clay is also present. These two soils should always be removed prior to laying asphalt atop, as they will never dry out, and the freeze cycle will turn the wet clay into a larger ice cube.

The other issue that we find every day, is the installation of an insulation board under the soil, between the block foundation and the wet soils. This insulation board not only traps water at the block foundation, it also creates absolutely no thermal break, as many contractors believe it does.

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As you can see in the pics, the trapped water eats away at the block and helps the wet clay to retain more liquid, exacerbating the freeze/thaw cycle. When builders/developers put in driveways and sidewalks, there should always be a soil correction of poor soils, and the sub rate beneath the asphalt topping should be no less than “cobit” that will compact to a density of 95 percent to ensure the asphalt will retain its elevation.

If you see your concrete or asphalt toppings move at your home, winter to spring…call CBS for an evaluation!