Every driveway in Central Florida sits on sand, gets rained on most afternoons from June to September, and bakes the rest of the year. Concrete cracks here for a short list of reasons, and the crack usually tells you which one.
Here is the list, what each one looks like, and which ones a repair fixes.
1. The base was never built
This is the big one. Central Florida is sand over a high water table. Sand drains well and holds nothing in place. A driveway poured straight onto it, or onto a thin layer of whatever was there, settles wherever the sand compacts a little more under load. The slab bends, and concrete does not bend. It cracks.
The fix at pour time is a crushed limestone base, placed and compacted in lifts, so the slab sits on something that does not move.[1] That step is labor and material, and it is the one a cheap driveway skips. A lot of the 1990s builder-grade driveways in Metrowest, Dr. Phillips and Ocoee were poured this way, and they are reaching the end of their life together.
What it looks like: cracks in several places with no single cause you can point to, often with panels at slightly different heights. What fixes it: if it is one section, cut it out and rebuild the base under it. If it is the whole slab, replacement on a real base.
2. Water washed the base out
Even a decent base can be undermined by water. The usual spots are the apron at the street, where every storm runs across it, and anywhere a downspout or a gutter dumps onto the edge of the slab. Over years the water carries sand out from under that edge, the slab loses support there, and it drops and cracks.
Driveways poured without enough fall make it worse. Water that sits on the slab finds the joints and the edges and goes under.[2]
What it looks like: a settled corner or edge, usually at the street or under a downspout, with a crack running back from it. What fixes it: cut out the settled section, rebuild and compact the base, repour, and redirect the water so it does not happen again.
3. A root pushed it up
Live oaks are what make Winter Park, College Park and the older parts of Orlando look the way they do, and their roots run shallow and wide. A root under a driveway thickens a little every year and lifts the slab above it. After twenty years the panel is an inch high at the joint and cracked across the middle.
What it looks like: one panel sitting higher than its neighbors, a crack across it, and a tree within fifteen or twenty feet. What fixes it: cut out the lifted section and deal with the root. Where the tree can take it, surface roots in that area get trimmed. Where it cannot, or where the city protects the tree the way Winter Park does, the new section is poured thicker with a flexible joint or bridged over the root so it can keep growing. We do not take trees out.
4. It dried too fast
Concrete cracks as it cures because it shrinks. That is normal, and control joints exist to decide where the crack goes: a joint is a planned weak line, cut to about a quarter of the slab depth, spaced at roughly 30 times the slab thickness, so about ten feet on a four-inch driveway.[3] The shrinkage crack happens inside the joint and nobody sees it.
Pour in July, finish it fast ahead of a storm, skip the curing, and the surface dries before the concrete underneath. That is how you get random narrow cracks across a panel that is otherwise fine, and why we would rather pour in the cooler months.[4] Our guide on when to pour in Orlando covers it.
What it looks like: narrow, straight or slightly wandering cracks inside a panel, no settlement, no height difference. What fixes it: fill and seal. These are cosmetic.
Reading your own driveway
Stand at the street and look. Is one area damaged or is it everywhere? Is anything sitting at a different height? Is there a tree, a downspout or the street at the damaged spot? Can you fit a coin in the crack? Those four questions sort most driveways into repair, resurface or replace before anyone drives out, and we wrote a guide on making that call. Text us a photo and we will tell you what we see.
