Seal the Seam between your Garage Floor and Your Asphalt Driveway
(Use this method to seal cracks in your driveway, too, if you want the longest lasting repair!!)
Why should I seal the seam between my garage floor (or concrete foundation) and driveway? Come on, NH... I've got a toaster to clean!!
Depending on where you live and how active the local flora and fauna are, you may want to consider this little project. You should be able to do this in an hour or so and for under $20.00 materials cost.
Lets take these potential problems one at a time:
Water infiltration can lead to heaving and breakage in concrete and asphalt...
When water enters the seam or crack between an asphalt driveway and a concrete garage floor or foundation, it isn't a big deal in warmer climates for the most part. But in colder climates this water can cause damage to both the driveway and the concrete when it freezes.
Most people who live in climates subject to months of freezing weather are aware of tire and car suspension-destroying "frost heaves". Frost heaves are raised bumps in the road surface caused by the expansion of frozen water underneath the road surface. Frost heaves are like a progressive disease... small cracks in the road surface allow water to collect underneath the road surface. When the water freezes, the road surface is forced upwards leading to more cracks which lead to more water infiltration leading to more heaving... get the point?
Also, heaving that occurs in the asphalt driveway can produce enough force to, over time, break the edge of the concrete garage floor... especially if it wasn't an especially strong pour... leading to more repairs. And we all love unnecessary repairs, don't we? Sealing the seam eliminates this problem since it eliminates the water!
Insects love to make their home in nice moist little cracks!
Ants are fun! They like to make these cute little piles of sand and dirt outside their nests as they add room after room for their growing families. The problem is that this sand and dirt is never replaced, so over time hollows develop underneath driveway surface leading to 1) more water accumulation leading to 2) heaving due to freezing or even sagging. Keeping the ants out is easy... a good crack sealant will be impassible to the little buggers!
What about insecticides? They work for a short period of time, but the ants are persistent and before you know it they will be back!
Plants are amazingly strong, plenty strong enough to break up asphalt and concrete!
How to seal your concrete/asphalt seams...
The first step is to, if necessary, open up the crack so it is at least 1/4" wide and at least an inch or so deep. The crack filler is less likely to fail if it is firmly seated in the crack, as opposed to simply putting it over the surface as you would apply tub caulk! I used a Fein Multimaster with a carbide grout removal blade, which does a good job on both the driveway and the concrete and isn't dulled by the dirt! You can also use a grinder if you're careful. If the crack is already wide enough but just messy, you can use pretty much any tool that will fit into the crack to scrape out loose material... old screwdriver, prybar, chisel, "goth" fingernails, etc.