— By Charles Clevidence —
Why asphalt crack sealing is the most cost-effective preventive maintenance strategy.
Crack sealing is the process of applying a specialized rubberized sealant into cracks in asphalt pavement to prevent water, debris and chemicals from penetrating the surface and damaging the base and subbase layers. It serves as the pavement’s first line of defense against deterioration and can significantly extend the service life of the asphalt.
This treatment is most effective when performed early — while cracks are still small, typically a quarter-inch and wider, and before any major structural damage has begun. Crack sealing uses high-quality rubberized sealants that expand and contract with temperature changes, providing long term protection.
Types of Crack Seal
There are two main types of crack seal: band-over crack sealing and routed crack sealing.
1. Band-Over Crack Sealing
Band-over crack sealing is the more economical option. The process involves cleaning the crack and applying sealant directly over the top, creating a thin “band” across the surface. Because no routing is required, this method is faster, uses less labor and relies on simpler equipment.
• Typical Cost: Approximately $0.80 to $1.50 per linear foot
•Performance: Lower upfront cost but shorter lifespan; may require more frequent maintenance.
2. Routed Crack Sealing
Routed crack sealing requires more preparation. A machine cuts a uniform reservoir into the crack, which is then cleaned thoroughly and filled with rubberized sealant. This extra step increases material bonding and long term durability.
• Typical Cost: Approximately $1.50 to $2.00 per linear foot
• Performance: Higher upfront cost but noticeably longer-lasting results, making it more cost-effective over time.
The Science Behind Why It Works
Crack formation in asphalt is inevitable due to natural temperature cycles, which cause the pavement to expand and contract. Over time, oxidation, repeated traffic loads and moisture contribute to surface fatigue, ultimately leading to cracking. Once cracks form, water infiltration becomes the primary threat. Water entering through the cracks weakens the subbase, causing problems such as pumping, rutting, potholes and eventual base failure.
Crack sealing interrupts this deterioration process by keeping water, oil, salt and debris out of the pavement structure. This preserves the load-bearing capacity of the base and sub-base and reduces water saturation. The rubberized sealant used in crack sealing is flexible, expanding in summer heat and contracting in colder temperatures. This flexibility helps prevent cracks from widening and minimizes the development of secondary cracking, maintaining the pavement’s structural integrity over time.
Long Term Pavement Performance Benefits
Crack sealing as part of a pavement preservation program can extend pavement life by 50% or more. It keeps roads, parking lots and airport runways performing at a high level with minimal intervention. By preventing cracks from developing into ruts and potholes, it maintains smoother ride quality, providing safer, quieter and more comfortable driving surfaces.
A well-sealed surface looks clean and maintained, reflecting positively on commercial properties and municipalities. Proper crack sealing also prepares the surface for sealcoating or overlays, ensuring subsequent maintenance layers bond effectively and preventing reflective cracking in future overlays.
Preventive Maintenance vs. Reactive Repairs
Reactive maintenance, such as fixing potholes and patching failures, occurs after damage is visible and structural failure has begun. Costs are high and benefits are short term. Preventive maintenance, including crack sealing, targets early distress before it spreads. It protects underlying layers and prevents exponential deterioration.
Crack sealing is the cornerstone of every pavement preservation strategy. Along with sealcoating and striping It creates a complete, proactive maintenance cycle.
Timing and Best Practices
The ideal time for crack sealing is when cracks are one quarter-inch and wider and the pavement condition index (PCI) is above 60, avoiding extreme cold or immediately after rainfall.
Surface preparation is key. Cracks should be thoroughly cleaned using high-pressure air, heat lance (preferred), or wire brush, removing vegetation, debris and moisture before sealing. Ensuring proper material heating (375°F to 400°F typical) to reach maximum viscosity is critical. Post-application care involves allowing the sealant to cool before traffic and applying blotting material (sand, toilet paper and water) if needed to prevent tracking.
Case Studies and Proven Results
• Municipal programs: Many DOTs report 7 to 10 years of extended pavement life with consistent crack sealing. Studies show crack-sealed roads require 40% to 60% fewer major repairs over 20 years.
•Commercial parking lots: Property owners see 2 to 3 times longer surface life compared to unsealed lots. Annualized maintenance costs drop by over 50%.
•Airports and industrial facilities: Crack sealing is critical for safety and operational efficiency. FAA recommends regular sealing under Advisory Circular AC 150/5380-6C.
Safety and Operational Benefits
Crack sealing reduces pavement hazards by minimizing potholes, rutting and loose debris while improving traction and drainage. The process is quick, allowing parking lots to reopen within hours and avoiding long term closures. Sealed surfaces also protect painted stripes and reflective markings from water intrusion, enhancing visibility and line marking longevity.
Integration Into Pavement Management Programs
Crack sealing fits neatly into pavement management systems (PMS) based on PCI (pavement condition index) ratings and is ideal for scheduling at mid-life intervals (2 to 4 years after paving). It allows maintenance of more traffic or square footage for the same budget, encourages steady annual preservation funding and supports asset valuation by maintaining higher residual pavement value and reducing long term infrastructure depreciation.
Summary: Why Crack Sealing Is the Smartest Investment
Crack sealing is simple, fast, affordable and proven. It protects your investment in asphalt pavement by keeping water out and maintaining structural integrity. It maximizes lifecycle value through lower annualized costs, longer service intervals, better aesthetics and improved safety. As a cornerstone of sustainable pavement management, sealing small cracks today prevents large costs tomorrow.
Key Takeaway Summary
Crack sealing is the most cost-effective preventive maintenance measure available, saving $4 to $10 in future repairs for every $1 spent. It extends pavement life by 4 to 10 years or more, prevents water infiltration and subbase damage, reduces potholes, rutting, and structural failure, improves ride quality, safety and appearance. It is easy to implement with minimal disruption and works best as part of a proactive pavement preservation plan.
In short, asphalt crack sealing is the highest-value, lowest-cost preventive maintenance you can perform. It’s a small investment that delivers large, measurable returns in performance, safety and longevity, making it the foundation of every successful pavement management program.
References
• Materials and Procedures for Sealing and Filling Cracks in Asphalt Surfaced Pavements (FHWA RD 99-147) — A manual of practice by FHWA and the Strategic Highway Research Program (SHRP).
• LTPP Pavement Maintenance Materials: SHRP Crack Treatment Experiment, Final Report (FHWA RD 99-143) — FHWA report on SHRP H-106 / Long-Term Monitoring project studying crack treatments with cost-effectiveness analysis.
• Louisiana Department of Transportation and Development — Observations show many districts use crack sealing, with performance-life extension reported.
• Montana Department of Transportation — Cost-Effectiveness of Crack Sealing Materials and Techniques for Asphalt Pavements (Western Transportation Institute).
• Crack Sealing in Flexible Pavements: A Life Cycle Cost Analysis (Canada / Ontario) — Life-cycle cost analysis by the Ministry of Transportation of Ontario, showing crack sealing can extend asphalt pavement service life by 2-5 years.
— Charles Clevidence, CEO and owner of Fighting Charlie’s Asphalt and Concrete, is an industry leader and national expert in asphalt, concrete, roofing and construction with over 30 years of experience. Fighting Charlie’s self-performs and project manages new paving and repair projects of all sizes from sealcoating to extensive full-depth repairs. Owners and managers of commercial properties across the country rely upon Fighting Charlie’s for parking lot striping and maintenance. The company focuses on preventative concrete repair and maintenance services from micro-surfacing to drainage repairs and everything in between. Email: Charles@fightingcharlies.com.