Understanding the Difference Between Resin Bound and Resin Bonded Surfacing
What is Resin Bound Surfacing?
Resin bound surfacing creates a smooth, self-draining surface when installed on an open grade binder or a base with drilled holes. This method involves mixing aggregate materials like shingle, quartzite, or crushed granite with a clear, UV-stable polyurethane resin. The mixture is prepared using a specialized forced-action mixer to ensure that every particle is thoroughly coated. The mixture is then hand-trowelled to form a seamless, compact, and level surface.
Resin bound systems are highly permeable, allowing surface water to filter through tiny voids in the structure, making them ideal for driveways, pathways, tree pits, and areas prone to standing water. This permeability makes resin bound surfacing compliant with SuDS (Sustainable Urban Drainage Systems) regulations. Additionally, the smooth, stone-free finish is perfect for wheelchair access and can withstand pressure washing, ensuring long-term durability.
What is Resin Bonded Surfacing?
Resin bonded surfacing, by contrast, involves applying a layer of resin to a non-porous asphalt or concrete base, onto which loose aggregate is scattered. This creates a textured, non-permeable surface that is effective for quick, cost-efficient renovations or for adding an instant facelift to existing surfaces.
However, resin bonded systems are less durable than resin bound surfaces. Over time, the loose aggregate can become dislodged, and the surface is more challenging to clean. Additionally, because resin bonded surfacing is non-permeable, it requires proper drainage solutions such as soakaways or eco-drains to manage water runoff. It is not compliant with SuDS regulations.
Key Differences Between Resin Bound and Resin Bonded Surfacing
| Feature | Resin Bound | Resin Bonded |
|---|---|---|
| Permeability | Fully permeable, water drains through | Non-permeable, requires drainage |
| Surface Texture | Smooth and seamless | Rough and textured |
| Durability | Highly durable, no loose stones | Less durable, aggregate may loosen |
| Compliance with SuDS | Yes | No |
| Maintenance | Easy to clean, withstands pressure washing | More challenging to clean |
| Recommended Use | Driveways, footpaths, terraces, tree pits | Quick renovations, aesthetic upgrades |
Bound vs. Bonded: Key Takeaways
While the terms “resin bound” and “resin bonded” are sometimes used interchangeably, they refer to two distinct systems with different results. Resin bound surfacing provides a durable, smooth, and self-draining surface that complies with SuDS regulations, making it ideal for areas where water management and long-term performance are priorities. Resin bonded surfacing, on the other hand, offers a cost-effective and textured option for quick upgrades but lacks the durability and permeability of resin bound systems.
At our company, we always prioritize clarity and precision in our work. That’s why we never use the term “resin bonded” as a catch-all for both systems—their differences are significant and impact the final results. Whether you need a smooth, self-draining surface or a quick aesthetic facelift, understanding the distinctions ensures the right choice for your project.
