Fortunately you can avoid issues of this nature by making your concrete's expansion joints watertight.

With spring coming there's no better time to do this project and it's certainly a weekend DIY task.

Here's a short description

+Remove old sealant or felt from between expansion joints

+Use an angle grinder to detach stubborn sealant or felt

+Wear goggles and gloves to protect your self from the sparks or debris from the grinder

+Vacuum or blow out any dust, dirt, or debris from the joint

+Add closed cell foam backer rod between expansion joints

+Ensure the backer rod is 1/8 inch wider in diameter than the joint

+Place the backer rod 1/4 beneath the surface of the concrete pad

+Apply self-leveling sealant onto of the backer rod (I used Sikaflex SL)

+Don't walk or drive on the sealant for 3-5 days

You can buy the self-leveling sealant at Home Depot or your local hardware store.

For more tips, pictures, and two short videos check out my post at http://www.homerepairtutor.com/concrete-expa...