A strange sight on the road to Banwell
Drivers passing the Banwell Road and E.C. Row Expressway Interchange in Windsor, Ontario have likely done a double take. Hundreds of large, white blocks are stacked several feet high near the site of a new overpass, and they are not concrete or steel. They are giant foam blocks, and they are playing a key role in getting the overpass approach built.
Why foam instead of dirt
On a typical road project, crews build up the approach to an overpass using compacted soil or gravel. That process takes time, since the ground needs to settle before pavement and infrastructure go on top. It can also put a lot of weight on soft or unstable ground, which risks uneven settling down the line.
Expanded polystyrene, the same lightweight foam used in packaging and insulation, solves both problems. The blocks are a fraction of the weight of soil, which means they place far less stress on the ground underneath. They also come pre-formed and stack quickly, which speeds up construction compared to waiting for traditional fill to compact naturally.
What this means for the project timeline
Using foam blocks for the overpass approach is a technique that has been used elsewhere in Canada and internationally for projects built on soft soil or where minimizing settling is a priority. For Windsor, it means the Banwell Road and E.C. Row Expressway Interchange project can move forward more efficiently, with less risk of the road surface shifting or cracking once traffic starts using it.
The interchange sits along one of Windsor's busiest corridors, connecting local traffic to the E.C. Row Expressway. Once complete, the overpass is expected to improve the flow of vehicles through the area and reduce congestion at what has been a notoriously busy stretch of road.
A growing trend in Ontario infrastructure
Windsor's project is a reminder that Canadian infrastructure work increasingly leans on newer construction techniques to save time and money, especially in cities managing tight budgets and growing traffic demands. As more municipalities across Ontario tackle aging interchanges and expressways, methods like lightweight fill construction could become a more familiar sight on job sites well beyond Windsor.
For now, the hundreds of foam blocks stacked near Banwell Road remain a curiosity for drivers, but they are doing serious work behind the scenes to get Windsor's newest overpass built faster and more reliably.
Source: CBC News
