A gap or height change between a garage floor and driveway usually forms because the two slabs are separate pieces of concrete that can move independently, and the driveway apron may settle, heave with frost or shift as the soil beneath it changes. A worn or missing joint filler can also make the gap more noticeable.
This transition sees vehicle weight, snow, salt and water every day. In Michigan, it is a spot where garage-area concrete often changes over time.
Why the Transition Moves
The garage floor is often inside or partly protected by the building, while the driveway apron sits outside. Each one responds differently to temperature, moisture and freezing.
Soil under the apron may have been backfilled near the foundation, which can compress over time. Water from roof runoff or melting snow can also soften or wash out soil at this edge. In winter, freezing ground can lift the apron, and it may not return to the same position in spring.
These are possible factors. The appearance of the gap alone does not prove which one is involved.
Why It Matters
A gap lets water and salty slush run under the slabs, which can lead to more movement and erosion. A height difference can catch tires, snow blowers and feet, and it can make the garage door seal sit unevenly.
If the driveway apron tilts toward the garage, water may flow into the garage instead of away from it.
Over time, the edge of either slab may chip or break where tires roll over a height change.
Options That May Help
For a small gap with little height change, sealing the joint with a flexible filler can help keep water out. This works best when the slabs are not moving much.
If the apron has dropped, it may be a candidate for concrete leveling, depending on its condition. If it is badly cracked or keeps moving, replacing the apron section with attention to support and drainage may be the better long-term choice.
Drainage improvements, such as redirecting downspouts away from the apron, can help whatever repair is chosen last longer.
Fixing the transition before winter can help keep snowmelt from running under the slabs and freezing.
What an Evaluation Looks At
A contractor may check how much the slabs have moved, whether the movement changes with the seasons, the condition of both slabs and where water goes during storms and thaws.
Noting the gap size in summer and again in winter can help show whether frost is part of the picture.
If the transition between your garage and driveway has changed, an on-site review can help sort out the options. Learn more about our concrete garage floor services in Kalamazoo, or call (269) 404-2457.
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