Yes – resin bound driveways are permeable. When a contractor lays a resin bound driveway, they mix the resin and aggregate (stones) in a forced action mixer. They then trowel this over a prepared concrete or bitmac base. Small gaps between the stones and resin mean that water can pass through, stopping pooling or flooding on your driveway.
Having a permeable surface for your driveway is important because as the amount of built-up areas in the UK increases, water doesn’t have anywhere to run off to during heavy rainfall. This has lead to lots of flash flooding and damage to people’s homes. With a permeable surface like a resin bound driveway, water can filter through the sub-base and into the ground. Resin bound driveways, when installed correctly, are SuDS (Sustainable urban Drainage Systems) compliant and contribute to flood prevention.
However, resin bound driveways are not to be confused with resin bonded driveways, which aren’t permeable. The resin is spread on the surface on its own, then the aggregate is scattered over the surface, where most of it will stick but some stones may remain loose. Because the resin is laid on as a complete surface, it doesn’t have the tiny holes that a resin bound driveway has, so the water won’t drain. It also means that the surface isn’t frost-resistant, so you might notice that it gets slippery.
If you live in a particularly flood-prone area and you’re considering a resin driveway, it’s best to go for a resin bound driveway for its permeable surface. That way you’ll stop flash flooding around your property and contribute to helping the environment.