On Sunday, February 2, 2014 4:47:42 PM UTC-5,
hrho...@sbcglobal.net wrote:
> On Sunday, February 2, 2014 10:32:15 AM UTC-6, Rebel1 wrote:
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> > After maybe a week of temperatures continuously below freezing, day and night, my driveway raises well above the level of the garage's concrete.
http://www.flickr.com/photos/90278919@N00/12270828796/ The baking soda box is 2" high. The edge of the blacktop closest to the box is raised about 1.5"; about a foot further from the garage, the blacktop is maybe 2" high. The house is on a slab. Soil in central NJ is somewhat heavy, but not clay-like. The whole property slopes gently down toward the street, which is 100 feet away. (According to Google Earth, the street end of the driveway is 3 feet lower than the garage end.) Behind the garage is a utility room. A little far-fetched that the water under the blacktop gets there by seeping from the back yard under the 28' slab to the start of the blacktop. I have two good gutters taking roof water away from the blacktop. Each discharges its water at least 12 feet from the sides of the blacktop. One discharges its water about 25 feet closer to the street; the other discharges about where the blacktop meets the garage, but as I said 12 feet to one side. The driveway is 10 years old. The old one, which was completely ripped out down to bare soil, also showed the same cold-weather behavior. Even though it's only a cosmetic problem, and the blacktop will be level with the concrete once the weather warms, any ideas how to prevent this seasonal rise and fall? Thanks, R1
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> The title of the OP should say freezing weather, not cold weather. Nothing happens until there is freezing weather.
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> It's pretty obvious that there is no seal between the garage and the driveway, so moisture will get into the ground all along the area between the two sides of the driveway whenever it rains. Next year, after the driveway sinks back down, seal the seam so no water can get into the soil right along the edge of the driveay and the garage.
That's worth a try and certainly can't hurt. If
it's not the major cause of the problem though, it
will still lift anyway pulling the seal out with it,
so it may not last. But even if it doesn't stay
really sealed, even reducing the gap may help.
They have a rope type product that you can put in the
crack, if it's wide enough, then heat with a torch to
melt.
Dig something so that any water along the edge of the driveway drains rapidly away, to reduce the moisture in the ground along the side of the filled up seam. You will still have some heaving along the edge of the driveway, but nothing like what you have now. It is fairly obvious that the original installation was deficient in having good drainaige for rainwater under and along the edges of the driveway, so you will have to live with that unless you are willing to redo the entire apron area of the driveway with a proper sand and gravel base.
Agree. The most likely root cause here is an improper
base. The best he can do short of ripping it out is to
get out there in a heavy rain and see how and where the
water is flowing. Anything that can be done to get the
water away from the sides where it can get under the
asphalt should help. And you really need to look when
it's raining. What you think might be happening based
on grade, etc, and what actually happens may be different.
The idea of having a board to place on the concrete at
the lifted edge that someone else suggested is a good
idea too. That could help keep the asphalt from
starting to crumble.