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When agencies consider shifting from reactive maintenance to a proactive pavement preservation strategy, several key questions often arise. This FAQ addresses common concerns to help guide the decision making process and spark follow-up questions. The goal is to help road managers make informed decisions that extend pavement life, optimize budgets and improve network performance.
Preservation is most impactful when keeping good roads good. To determine the eligibility of your road for certain treatments, this process is recommended.
Steps to Decide on Preservation vs. Replacement:
Visit this page for a visual guide to pavement conditions.
Did you know? Evergreen’s superintendents are able to go out and meet with a municipality or county to walk their roads, and to help determine the best option for that pavement. We might provide real-life examples of what we have done in other places and offer tours of those projects to share results.
If you look at the big picture, preservation almost always gives you more value over the life of the pavement. The earlier you apply it—before the road really starts to break down—the better the payoff. In fact, most studies show that every dollar you put into preservation can save you somewhere between $4 and $10 in future rehab costs.
That said, it is not a one‑size‑fits‑all decision. Preservation is the smart move as long as the pavement structure is still sound. You are essentially buying time and stretching the life of the road at a fraction of the cost of rebuilding it. But once the pavement drops into serious structural failure, preservation will not fix the underlying problems—at that point, reconstruction and recycling are the most realistic options.
Use preservation strategically to save money long‑term. Save reconstruction for the pavements that are too far gone to rescue.
Multi-Year Pavement Preservation Budgeting:
If you are looking at your return on investment for chip seals or micro‑surfacing, the short answer is both give you a very strong return, especially when you apply them before the pavement starts slipping into structural trouble. Think of them as low‑cost ways to buy several extra years of life out of a road that is still in decent shape.
Chip Sealing: About as cost‑efficient as it gets.
Micro‑Surfacing: A bit more expensive than chip sealing, but you get a smoother surface and more versatility.
In summary, both treatments cost a fraction of reconstruction. Each one cuts off future rehab costs by stretching service life now. Preservation now is almost always cheaper than rehabilitation later — and chip seals and micro‑surfacing are two of the fastest ways to lock in those savings.
Chip Seal:
Slurry Seal:
Preservation treatments generally use less raw material, consume less energy and produce less emissions (30% to 70% reduction in GHG emissions compared to HMA overlays). However, the biggest reason this approach is more sustainable is because it extends pavement life, so you can delay the need for more disruptive and resource-intensive reconstruction projects.
We have prompted HeyNAPA* as a primary reference for these common questions. To dive in deeper try prompting HeyNAPA with your questions, or visit roadresource.org, a great source of information.
For extra guidance, our team is ready to partner with you to explore solutions that fit your goals and budget. Reach out today!
*The HeyNAPA chatbot pulls its information exclusively from the following sources using a ChatGPT-4 engine to provide trustworthy answers and a paper trail of resources:
