Garage Floor Cracks: Normal or a Sign of a Bigger Problem?
If you have noticed a crack running across your garage floor, you may immediately wonder: Are cracks in garage floors normal? Some small cracks can develop naturally as concrete cures and ages, but wider, uneven, spreading, or worsening cracks may point to settlement or changing soil conditions beneath the slab. Knowing the difference can help you address problems before they become more severe. If your garage floor is cracked, sinking, or uneven, call TFS – The Foundation Specialists or fill out the form below to schedule your FREE inspection. Our team can evaluate the concrete, identify the cause of the damage, and recommend an appropriate repair solution.
Why Do Garage Floors Crack?
Concrete is extremely durable, but it is not completely resistant to cracking. A garage slab can develop cracks for several reasons, ranging from normal curing to movement underneath the concrete.
As concrete cures, it loses moisture and shrinks slightly. This process can create small shrinkage cracks that do not necessarily indicate a serious problem.
Other cracks, however, can develop because the soil supporting the garage floor has changed. Soil can wash away, shrink during dry conditions, become poorly compacted, or lose its ability to evenly support the slab. When part of the concrete no longer has sufficient support, the slab may settle and crack.
What Garage Floor Cracks May Be Normal?
Small hairline cracks can be common in concrete, especially as the slab ages. A thin crack that remains relatively consistent in width and does not have a noticeable height difference from one side to the other may simply be related to shrinkage.
Control joints are also intentionally placed in concrete to help manage where cracking occurs as the slab expands, contracts, and cures.
Even when a crack appears minor, however, it is worth monitoring. Take a photo and periodically check whether the crack is becoming wider, longer, or uneven.
When Should You Be Concerned About Garage Floor Cracks?
When homeowners ask are cracks in garage floor are normal, the appearance and behavior of the crack matter more than the fact that a crack exists.
Potential warning signs include:
- One side of the crack sitting higher than the other
- Cracks that continue to widen
- Multiple cracks forming in the same area
- Sections of the floor that appear sunken
- Noticeably uneven or sloping concrete
- Cracks accompanied by gaps along walls
- Water entering through damaged areas
- Cracks that return or worsen after previous repairs
A height difference across a crack is especially important because it can indicate that portions of the slab are moving independently.
What Causes a Garage Floor to Sink?
Your garage floor depends on the soil underneath it for support. If that support changes, the slab above can move.
One common issue is poorly compacted soil. If fill soil was not adequately compacted before the garage floor was poured, it may gradually compress beneath the weight of the slab.
Water can also contribute to settlement. Drainage problems may cause soil beneath or around the concrete to erode or wash away. On the other hand, extended dry conditions can cause certain soils to shrink, creating voids underneath the slab.
Once unsupported spaces develop beneath the concrete, the slab can begin to sink, tilt, and eventually crack.
Can a Cracked Garage Floor Be Repaired?
Yes. Depending on what caused the damage, replacing the entire garage floor may not be necessary.
At TFS, the repair process begins by identifying why the concrete cracked. Simply filling a crack without addressing underlying settlement may leave the original cause unresolved.
PolyLevel
For garage floors that have settled, PolyLevel can be used to lift and stabilize the concrete. Small holes are drilled through the slab, and a lightweight polyurethane foam is injected underneath.
As the material expands, it fills voids beneath the concrete and can help lift the slab toward its original position. Once complete, the garage floor has additional support beneath the affected areas.
NexusPro
After the slab has been stabilized, cracks and joints can be addressed with NexusPro Joint Sealant. NexusPro creates a durable seal designed to withstand the expansion and contraction concrete experiences over time.
Sealing cracks also helps reduce water intrusion through damaged areas.
Vuba Stone
For homeowners who want to improve the appearance of an existing garage floor after necessary concrete repairs, Vuba Stone may provide an additional resurfacing option when the existing concrete is structurally suitable.
At TFS, Vuba Stone installation requires the concrete to be properly repaired first. If the slab is uneven, PolyLevel is used to lift and stabilize it, while NexusPro addresses cracks and joints before the Vuba Stone system is installed. The finished resin-bound stone surface can give aging concrete a completely updated appearance.
Should You Fill a Garage Floor Crack Yourself?
A store-bought crack filler may improve the appearance of a small crack temporarily, but it cannot correct settlement underneath the slab.
If a garage floor is actively moving, filling the visible crack only addresses the symptom. The crack may reopen, or additional damage may develop as the concrete continues to move.
That is why determining the cause of the cracking is an important first step before deciding how it should be repaired.
Have Your Garage Floor Cracks Inspected by TFS
So, are cracks in garage floors normal? Small, stable hairline cracks can occur as concrete cures and ages, but cracks that widen, become uneven, accompany sinking concrete, or continue to change deserve a closer look. Depending on the cause and condition of the slab, TFS can use solutions such as PolyLevel for lifting and stabilization, NexusPro for cracks and joints, and Vuba Stone for resurfacing after the necessary repairs have been completed. Call TFS – The Foundation Specialists or fill out the form below today to schedule your FREE inspection and find out what your garage floor cracks may be telling you.
For regular before & after stories and industry updates, follow us on Instagram and Facebook.