Why Calculate the Gravel Amount for Permeable Floors?

Permeable flooring systems are designed to let rainwater drain efficiently, preventing puddles and surface flooding while offering an attractive finish for outdoor spaces. The right balance of gravel (aggregates) and resin ensures optimal drainage, strength, and longevity. Whether you are a DIY enthusiast or a professional landscaper, correct measurements help you avoid waste, keep budgets in check, and guarantee professional-quality installations.

Product Overview: Kits, Aggregates, and Binders

ResinPro offers a complete range of permeable flooring solutions for every need:

• “Flowstone” – Complete Permeable Floor Kit with Pebbles and Resin: All-in-one solution with precisely measured components, matched to the size of your project, including high-performance binder resin and selected decorative aggregates. Suitable for driveways, patios, and walkways.
• Washed Pebbles for Permeable Floors 25kg – Outdoor Resin-Bound Surfaces: Ideal for creating permeable floors, these 4–8 mm pre-washed pebbles provide hassle-free application and excellent drainage properties. Recommended coverage is one 25kg bag per square metre.
• “Trasparente” – Epoxy Binder for Coloured Pebbles and Grits: Transparent epoxy binder designed for coloured stones and grits, with UV-resistance and non-yellowing properties, suitable for vibrant, lasting floors.
• “Polirock” – Polyurethane Binder for White Stones, 2kg Two-Component Kit: Polyurethane resin binder formulated for white stone applications, offering superior weather resistance, anti-slip finish, and no-yellowing performance for clear, attractive permeable surfaces.

How to Calculate Your Gravel and Resin Needs

The amount of gravel required depends on the area and thickness of your floor. For most outdoor resin-bound projects, one 25kg bag of Washed Pebbles covers approximately one square metre. For areas exposed to vehicle traffic, thickness can be increased and base preparation adapted using concrete or reinforcement grids. View our Pebble Floors category for greater detail on various surface options.

Estimating resin quantity is equally important. For example, with “Trasparente” – Epoxy Binder for Coloured Pebbles and Grits, a typical ratio is about 3% resin by weight of aggregate—meaning 800g resin per 20–25kg of stones. “Polirock” – Polyurethane Binder for White Stones calls for approximately 1 kg of binder per 6–8 kg of aggregate.

Opt for the “Flowstone” – Complete Permeable Floor Kit with Pebbles and Resin for a guided, all-in-one experience—kits are available in multiple surface area coverages to suit both small paths and large driveways.

Comparison Overview: Product Selection for Every Project

Choosing the correct components depends on floor location and visual preferences. Washed Pebbles for Permeable Floors are best for natural appearances and eco-friendly landscapes. For a crystal-clear, durable finish with coloured or dark aggregates, “Trasparente” – Epoxy Binder offers proven UV-resistance. For white stones and maximum non-yellowing, select “Polirock” Polyurethane Binder. Lastly, for the most convenient approach, the “Flowstone” Kit includes everything you need—resin, aggregates, and comprehensive instructions.

Key Factors When Installing Permeable Gravel Floors

Installation success is about more than just quantities. Always work within recommended weather conditions: apply resin at temperatures between 10°C and 40°C, avoid high humidity, and prepare a stable base for long-term durability. The premixed system—combining stones and resin before laying—ensures the structure remains permeable, strong, and visually appealing.

Both the “Trasparente” Epoxy Binder and “Polirock” Polyurethane Binder are designed for safety and easy maintenance. Surfaces created using these binders are typically walkable after about 12 hours (at approximately 20°C) and fully cured within 36–48 hours, dependent on local conditions.

Eco-Friendly & Versatile Flooring Solutions

Resin-bound permeable flooring not only delivers modern curb appeal but also supports the environment by reducing runoff and aiding groundwater recharge. Materials such as the Washed Pebbles for Permeable Floors 25kg are sustainably sourced, and certified as safe for humans and pets after curing. These solutions suit diverse outdoor settings—paths, patios, car parks, and garden features—all while remaining customisable in colour and texture.

Installation Guidance and Surface Preparation

Creating a professional-quality permeable floor involves a few key steps: substrate preparation, careful mixing of gravel and resin, compaction and levelling, and optional sealing or finishing for extra durability. For small to medium projects, standard tools and a mixer suffice, with the “Flowstone” Complete Permeable Floor Kit providing clear, stepwise instructions suitable for all levels of experience. For high-traffic or vehicular areas, increase both resin and aggregate thickness, and consider sub-base reinforcement.

Browse the Pebble Floors range for more product options, application tips, and inspiration for your resin-bound surface.