A new road isn’t something you can just lay asphalt on. Like baking a tiered cake, it’s built in layers, and each one needs to be prepared properly. It starts with the soil beneath the road, followed by drainage plans and a ton of base preparation work most people never think about.
By the time you see street crews roll the paver, the ground underneath has already been tested and shaped. Skip any key ingredients or steps, and just like a cake, it will crumble and fail. Poor road preparation can lead to cracks, potholes and sinkholes that nobody wants.
Here’s what actually happens before the first layer of asphalt goes down.
Base Work and Site Preparation Comes First
All projects, without exception, start with clearing the site. A team will remove all trees, brush and old pavements, then score or grade the land to the right elevation and slope. This important step controls how water moves once the road is done.
Soil testing happens at this stage too. Engineers need to know what they’re working with before building on top of it. Weak or unstable soil gets treated or replaced, as building on bad soil is like building a house on sand.
The base layer is arguably the most important part of the whole road, and it’s the part nobody sees once paving wraps up.
A strong base does three things:
- Distributes the weight of traffic evenly
- Prevents water from pooling under the surface
- Keeps the asphalt from shifting or cracking over time
Crews usually build the base with layers of crushed stone or gravel, compacted tightly with heavy machinery. Each layer gets compacted before the next one goes on. Rushing this step is one of the fastest ways to end up with a road that fails in year two instead of year twenty.
Thickness matters here too since roads built for heavy truck traffic need a deeper, stronger base than a quiet residential street. That decision gets made long before anyone touches asphalt.
With all this work going on, road construction sites become busy, and they’re dangerous if safety isn’t taken seriously.
Before any real work begins, crews set up:
- Signage and traffic control zones
- Barriers to keep workers separated from active traffic
- Clear detour routes for drivers
Worker safety matters just as much. Reflective gear, equipment checks, and clear site communication all get sorted out before construction ramps up. A well-run site protects both the crew and the public driving past it.
Drainage Planning Isn’t Optional
Water is asphalt’s biggest enemy. Left unmanaged, it seeps into the base, freezes, expands, and breaks everything apart from underneath.
That’s why drainage planning happens early, not as an afterthought. Engineers map out:
- Where water will flow during rain or snowmelt
- Where catch basins and culverts need to go
- How the road’s slope will direct runoff away from the surface
In Alberta, freeze-thaw cycles make this step even more critical. A road with poor drainage might look fine in summer and start falling apart by spring.
Inspections Before Paving Starts
Nothing gets paved until it passes inspection.
Engineers check the base for proper compaction and thickness. They confirm drainage systems are graded correctly and verify the soil underneath still meets project requirements after all the prep work.
This step exists for a reason. Once asphalt goes down, fixing a problem underneath means tearing it back up. Catching issues now saves time, money, and headaches later.
Why This Groundwork Matters
Nobody stops to admire a well-compacted gravel base, but it’s the reason some roads last for decades while others need repairs within a few years. A good asphalt surface can only perform as well as what’s underneath it, and that’s true for highways, residential streets, and everything in between.
At Holloway Paving, we treat the groundwork as seriously as the paving itself. Every project across Calgary and Southern Alberta starts with the same commitment to doing it right from the ground up.
Thinking about a new paving project? Visit Holloway Paving to see how we build roads that last.