How much stone do I need?
How much stone do I need for the ground?
For pebbles and gravel:
• ±80 kg per m², based on a 5 cm layer.*For grain sizes >32 mm a thicker layer is required.• Consumption per big bag: 1000 kg = 0.625 m³.
• Coverage: ±12.5 m² with a 5 cm layer.
For pine bark:
• ±70 L per m², based on a 5 cm layer.
• Consumption per big bag: 1000 L = ±1 m³ = ±600 kg
• Coverage: ±14 m² with a 5 cm layer.
For volcanic rock, slate and chamotte:
• ±50 kg per m², based on a 5 cm layer.
• Consumption per big bag: 1000 kg = ±1 m³
• Coverage: ±20 m² with a 5 cm layer
How much stone do I need to fill a gabion?
Density of ±1,650 kg per m³.
The calculation is easy to understand with an example: for a gabion measuring 100x50x30 cm, do the following:
1x0.5x0.3 = 0.15 m³
0.15x1,650 = 247.50 kg of stone.
*It is always a good idea to allow 5% extra, as gabions widen slightly when filled and always take a little more stone than the theoretical calculation.
Please note!
PLEASE NOTE! Before buying, read this information about gravel and pebbles
Grain sizes are sieve sizes, not exact measurements
When we talk about stone of, for example, 60-80 mm, we mean that the stones pass through an 80x80 mm square mesh and do not pass through a 60x60 mm one. A stone 100 mm long and 65 mm wide can easily pass through that 80x80 mesh, because the mesh sorts by the width of the stone as it passes through, not by its total length. That is why it is normal for a percentage of stones to have some dimension above 80 mm or below 60 mm.
Machines do not sort 100% accurately
In addition, no industrial sorting process is perfect: there is always a small percentage of stone which, due to speed, irregular shape or pieces overlapping on the belt, does not pass correctly through the corresponding mesh and slips into the grade, so stones larger than stated may occasionally appear. This is normal for this type of product and is not considered a defect.
Breakage of pebbles
In pebbles over 60 mm, up to 10% of the stones may break during sorting, washing, loading and unloading. We currently have no machinery that completely prevents this breakage. The product photos show only real pieces: broken pieces have not been removed.
Dust and sand in the product
This product is not washed, so it contains dust, sand and even traces of other materials from processing and transport. This is no problem for its use: the stone washes itself over time, or you can rinse it with water before use if you prefer.
Colour can vary considerably between batches
This is natural stone, and the colour changes from one batch to another, sometimes noticeably. This is especially important for multi-toned stones such as Blanco Rosa: some batches come out very white and others very pink, within the same product. If the exact shade is very important for your project, we recommend not buying this type of product online, as we cannot guarantee that the batch you receive will match the photo or a previous purchase.
Returns
Please bear in mind that returns, especially of 1,000 kg big bags, are usually complicated and expensive because of the weight and volume of the material. If the return is not due to an error on our part, the costs and arrangement of the return transport are borne by the customer.
Red Volcanic Gravel
Red Volcanic Gravel for Garden
Discover our volcanic gravel, a classic ideal for your garden. Perfect for your plants and trees, this gravel helps maintain the moisture of the soil, protecting your land and promoting optimal growth.
We have volcanic gravel in two colors: garnet red and natural (more grayish), as well as in a wide variety of sizes or granulations for you to choose the size you like best.
Placement of Red/Garnet Volcanic Gravel for Garden
The placement of volcanic gravel is simple. We recommend using a weed control fabric to prevent the growth of weeds that harm your plants. Once the fabric is laid, simply add the stones; at least two layers are recommended for better soil and moisture protection.
How much gravel do I need per m²?
A common question is how much gravel you need. The equivalence of 1 m³ of stone (whether it is gravel, pumice, or volcanic clay) is approximately between 900 and 1,000 L. To cover 10 m² with gravel of 10-25 mm, a thickness of 40 mm is recommended, resulting in 0.4 m³ (400 L). If you prefer the size of 25-50 mm, you will need approximately 0.8 m³ (800 L) with a thickness of 80 mm. Calculating is easy, but if you need help, feel free to contact us.
Color and Characteristics of Volcanic Stone
Our volcanic gravel is available in red and natural. It is important to note that the intensity of the color may vary depending on the moisture of the stone. Although the gravel appears consistent, it may show subtle color differences between different batches and depending on exposure to light and moisture. Keep this in mind when making your choice.
💡 Torn between red and natural, or unsure how much you need? Read our complete guide to volcanic stone for the garden.
Frequently asked questions about gravel, pebbles and decorative stone
¿Por qué elegir grava volcánica?
Porque es ligera, retiene la humedad del suelo y protege las raíces de los contrastes térmicos: perfecta para zonas de plantas y árboles.
¿Qué diferencia hay con la volcánica natural?
El color: esta es rojo granate; la natural tiene un tono más grisáceo.
¿Por qué se vende por litros?
Porque pesa mucho menos que una grava convencional: el saco es de 20 L y el big bag de 1.000 L (1 m³).
¿Cuánta cantidad necesito por metro cuadrado?
Se vende por litros porque es muy ligera: calcula unos 50 L por m² para una capa de 5 cm. Un big bag de 1.000 L cubre alrededor de 20 m².
¿Qué granulometría elijo?
Hay 4 medidas: 5-10 mm, 10-25 mm, 25-50 mm, 2-5 mm. Para zonas de paso y estabilizadores de grava elige la más fina; las medias decoran parterres y alcorques, y las gruesas son puramente decorativas o para gaviones, no para pisar.
¿En qué formatos se vende?
En Saco 20 L, Big bag 1.000 L. | 1 m³. El transporte te deja el palet o big bag en la puerta de casa.
¿Hace falta malla antihierbas debajo?
Sí, muy recomendable: una malla o geotextil antihierbas bajo la piedra evita que salgan malas hierbas y facilita el mantenimiento durante años.