Asphalt is a common material used for driveways, but cracks and small holes can appear over time. Fixing these cracks early helps your driveway last longer and keeps it looking nice. It stops water from getting under the surface, prevents small damage from turning into large expensive problems, and keeps your driveway looking clean and solid for years longer. A basic crack sealing job costs a fraction of what a full driveway replacement runs, and most homeowners can do it themselves on a dry weekend afternoon.
This guide covers everything you need to know about how to seal cracks in asphalt driveway surfaces the right way and keeping your driveway in good shape long after the repair is done. Whether you are a homeowner in Phoenix, AZ looking to protect your driveway before winter hits or simply trying to stay ahead of surface damage, SS Paving has put together this complete guide to help you get it done right the first time.
Why Sealing Cracks Is Important
Sealing cracks early is important because every crack is an open door for water to get under the surface. Once water reaches the base layer, it softens the ground and pushes the asphalt apart from below, especially during winter freeze and thaw cycles. Catching cracks early stops this damage before it spreads.
The bigger reason is money. A small crack sealing job costs almost nothing compared to what happens when cracks are ignored. Small cracks grow into potholes and potholes lead to full driveway replacement costing thousands of dollars. Sealing early saves you money and adds years to your driveway life.
Types of Asphalt Cracks You Can Seal
Asphalt driveways can develop different types of cracks, and each type may require a different repair method depending on the size and cause of the damage.
Hairline Cracks
These are the thinnest cracks on the surface, usually less than a quarter inch wide. They are easy to overlook but should be sealed as soon as possible before water finds its way in and makes the damage worse. Catching them early saves you from dealing with much bigger and costlier repairs down the road.
Linear Cracks
Long cracks that run straight or slightly curved across the driveway surface. They are mostly caused by aging asphalt, temperature changes, or regular traffic stress over time. If left alone, they widen quickly and allow water to reach the base layer underneath.
Edge Cracks
These cracks form along the outer edges of the driveway. Weak support on the sides and poor water drainage are the main reasons they develop. Improving drainage around the driveway edges can slow down this type of cracking significantly.
Alligator Cracks
A pattern of small connected cracks spread across a larger area, looking like reptile skin. This is a sign that the base layer underneath the asphalt has failed and simple crack filler will not be enough to fix it. The damaged base needs to be repaired first before any surface fix will actually hold.
Tools and Materials Needed
Having the right tools and materials before you start makes asphalt crack sealing easier, faster, and helps the repair last longer.
Asphalt Crack Filler
This is the main product you need for the job. Always choose a rubberized asphalt crack filler because it stays flexible after drying and handles temperature changes without cracking again. Avoid using concrete filler or any product not made specifically for asphalt.
Wire Brush or Crack Cleaner
Use this to scrape out all the loose dirt, debris, and old filler sitting inside the crack before you apply anything new. Skipping this tool is one of the main reasons crack repairs fail early because the sealer has nothing clean to bond to.
Leaf Blower or Broom
After scrubbing the crack clean, you need to clear away all the loose dust and debris from the surrounding surface. A leaf blower does this faster and more thoroughly than a broom alone and makes sure nothing gets trapped under the sealer.
Putty Knife or Squeegee
Once the sealer is applied, you need something to smooth it flush with the surrounding surface. A putty knife works well for smaller cracks and a squeegee covers larger areas faster. This step gives you a clean even finish that cures properly.
How to Seal Large Asphalt Cracks
For cracks wider than half an inch, do not just pour sealer straight in. The sealer will sink too deep and will not cure properly. Press a foam backer rod into the crack first so it sits about a quarter inch below the surface. This gives the sealer a firm base to bond to and helps it cure evenly from top to bottom.
If the crack is more than an inch wide, if the asphalt around it is crumbling, or if the surface is sinking or uneven, sealer alone will not fix the problem. At that point patching with cold mix asphalt material is the better option. Patching fills the structural gap properly and gives the area the solid base it needs before any sealer or sealcoat is applied on top.
How Long Does Asphalt Crack Sealing Last?
A good asphalt crack sealing job done correctly can last anywhere from 3 to 5 years. The quality of the sealer you use, how well you cleaned and dried the surface before applying it, and the weather conditions during application all play a big role in how long the repair holds. Driveways in areas with harsh winters or heavy traffic will naturally see repairs wear down a little faster.
The best way to stretch that lifespan even further is simple maintenance. Check your driveway every spring and fall and reseal any cracks that reopen before they get bigger. Apply a fresh sealcoat every 3 to 5 years to keep the whole surface protected. Small consistent upkeep like this costs very little and keeps your driveway in good shape for years longer than one that gets ignored.
DIY vs Professional Asphalt Crack Sealing
If the cracks on your driveway are narrow, isolated, and the surrounding asphalt is still solid, DIY sealing is a perfectly good option. A basic crack sealer from any hardware store and a few simple tools are all you need to handle most standard repairs yourself. It is affordable, straightforward, and something most homeowners can finish in a couple of hours on a dry weekend.
However, there are times when calling a professional is the smarter choice. If you are dealing with alligator cracks, large potholes, cracks that keep coming back in the same spot, or any sign that the base layer has shifted or failed, no DIY sealer will solve the problem. A professional has the right equipment and experience to fix the root cause properly and save you from spending money on repairs that will not last.
Tips to Prevent Future Asphalt Cracks
Regular maintenance and good drainage can help prevent new asphalt cracks and keep your driveway in better condition for years.
Improve Drainage
Make sure the ground around your driveway slopes away from the surface so water drains off quickly after rain. If water regularly pools along the edges or on the surface, adding a drainage channel can prevent serious base damage over time.
Avoid Heavy Loads
Keep heavy vehicles and equipment off the driveway whenever possible. If you need to park something heavy temporarily, spread the load using thick plywood boards under the tires to distribute the weight more evenly across the surface.
Keep the Surface Clean
Sweep away leaves, dirt, and organic debris regularly. Wet organic material sitting on asphalt holds moisture against the surface and speeds up deterioration. Fuel and oil spills should be cleaned up quickly because they break down asphalt binder over time.
Schedule Regular Sealcoating
Sealcoating every 3 to 5 years is the single best way to prevent cracks from forming in the first place. It keeps the surface sealed, flexible, and protected from the elements that cause the most damage.
When to Call a Professional Asphalt Contractor
If you notice alligator cracks spread across a large area, multiple deep cracks running in different directions, or sections of the driveway that are sinking and shifting, it is time to call a professional. These are signs that the base layer underneath has failed and no DIY sealer or patching material will fix the problem properly. Sealing over serious structural damage only delays the inevitable and usually makes the repair more expensive later.
Drainage problems are another reason to bring in a professional. If water consistently pools on or around your driveway after every rain, the grading underneath is the real issue and crack sealing alone will not solve it. A professional contractor can find the root cause, fix the base or drainage problem properly, and save you from dealing with the same damage over and over again season after season.
Is your driveway showing cracks that are getting worse every season?
SS Paving helps across Phoenix, AZ protect and restore their asphalt driveways with professional crack sealing, patching, and sealcoating services. Our team shows up with the right materials, the right experience, and a commitment to getting the job done properly the first time. Do not wait for small cracks to turn into costly damage. Book your appointment today for a free estimate and let us take care of your driveway before the next winter hits.
Conclusion
Sealing cracks in your asphalt driveway is one of the most practical and affordable things you can do to protect your home. Inspect the cracks, clean them out, dry the surface completely, choose the right sealer, apply it evenly, smooth it flat, and let it cure. Follow up with sealcoating and keep up with regular maintenance and your driveway will stay solid for years longer than one that is left untreated.
Most driveway problems do not happen overnight. They build up slowly from small ignored cracks that let water in and grow bigger every season. Catching them early and sealing them properly is the difference between a driveway that lasts 25 years and one that needs replacement in 10.
Frequently Asked Questions
What is the best sealer for asphalt driveway cracks?
Rubberized asphalt crack sealer is the best option for most driveway cracks. It stays flexible after curing, handles temperature changes well, and bonds strongly to asphalt surfaces for a long-lasting repair.
Can I seal driveway cracks myself?
Yes, most cracks under half an inch wide are easy to seal yourself with basic tools and a quality crack sealer from any hardware store. Wider or more serious damage may require professional help.
How long does crack sealer take to dry?
Most crack sealers dry to the touch within 1 to 4 hours but need a full 24 to 48 hours to cure completely before you drive on them. Always check the product label for specific cure times.
Should I seal cracks before sealcoating?
Yes, always seal individual cracks first and let them cure for at least 30 days before applying a sealcoat over the entire driveway. Sealcoating over unsealed cracks will not fill them properly and the cracks will show through.
Why do asphalt cracks come back?
Cracks return when the underlying cause is not fixed. Poor drainage, a weak base layer, heavy vehicle traffic, or skipping regular maintenance will keep causing new cracks even after repairs. Fixing the root problem is the only way to stop them from coming back.
