19/09/2026
BUILDING STABLE SURFACES WITHOUT SEALING THE GROUND — AN INTERESTING NEW SOLUTION FOR COSTA RICA
Anyone building in Costa Rica knows the challenge: around a home, you quickly end up with large areas that need a stable surface. Driveways, parking areas, access roads, and vehicle turnarounds all need to withstand regular traffic.
The conventional solution is often concrete or asphalt.
It works — but it comes with one major disadvantage: the ground becomes sealed, and stormwater has to be managed and redirected. In addition, large sealed surfaces can contribute to higher temperatures in the immediate surroundings.
In a country like Costa Rica, where rainfall can be extremely heavy, every additional sealed surface means that rainwater can no longer soak into the ground where it falls. Instead, it has to be directed through slopes, channels, drains, and other stormwater systems — potentially contributing to erosion farther downstream.
At one of our current projects, we are therefore using a system for the first time that is still relatively new to Costa Rica — and one that I find particularly interesting.
Plastic Grid Cells Instead of a Solid Surface
The concept is surprisingly simple:
Interlocking plastic grid panels are installed over a properly prepared base and then completely filled with gravel.
Once finished, the actual grid structure is virtually invisible. What you see looks like a regular gravel surface — but technically, it behaves very differently.
The grid stabilizes the gravel and keeps it in place. This helps prevent the material from constantly shifting under vehicle traffic and reduces the formation of the typical ruts, depressions, and uneven areas commonly found on conventional gravel driveways.
Systems like these are internationally known as gravel grids or plastic grid pavers. Their cellular structure stabilizes the aggregate while allowing the surface to remain permeable.
But for Me, the Most Important Advantage Is Below the Surface
A surface like this does not necessarily have to seal the ground.
Rainwater can pass through the gravel and — with the right base preparation and suitable soil conditions — continue into the ground below. Permeable surfaces can therefore reduce surface runoff and allow rainfall to infiltrate closer to where it actually falls.
And that is what makes this concept particularly interesting for Costa Rica.
During the rainy season, we can receive tremendous amounts of water. At the same time, continued development means more roofs, roads, parking areas, driveways, and concrete surfaces.
The more ground we seal, the more water we then have to manage and redirect through engineered drainage systems.
In a way, it becomes a rather contradictory cycle.
Why go to great lengths to redirect rainwater if, where conditions allow, we can simply let it soak into the ground where it falls?
Of course, this solution is not suitable for every property or every soil condition. Permeable systems also need to be properly designed and installed. Soil conditions, base preparation, load-bearing capacity, drainage characteristics, and the expected traffic loads all have to be taken into consideration.
Stability and Sustainability Don’t Have to be opposites
What I particularly like about this system goes beyond the technical solution itself.
It demonstrates that construction does not always have to involve choosing between functionality and environmental responsibility.
A driveway needs to be stable. A parking area needs to support vehicles. And nobody wants to redistribute gravel after every heavy tropical downpour.
But that does not automatically mean that the entire area has to be covered with concrete or asphalt.
If we can achieve the same functionality with a surface that is both stable and permeable, then it is certainly an alternative worth considering.
International green infrastructure concepts recognize exactly this advantage of permeable surfaces: they can perform many of the same functions as conventional paved areas while allowing stormwater to infiltrate or be temporarily stored, thereby reducing surface runoff.
At our current project, the system is being installed right now. Once the work is completed, the black grid panels will disappear completely beneath the gravel.
We expect, it will become a very interesting alternative to fully sealed surfaces for driveways and parking areas in Costa Rica.
Because building more sustainably does not always mean making construction more complicated.
Sometimes it simply means giving water the opportunity to follow its natural path again.
Thomas Falk
Falk Enterprises
"Building trust. Creating value."
