In order for artificial grass to look perfect, it needs a good foundation. Artificial grass cannot be laid on top of the original turf as ground conditions under the turf will cause mounds and dips in your new lawn, so it's crucial to have an artificial grass sub-base. This will require the removal of your existing lawn as well as the levelling and compacting of two layers of aggregates, known as the sub-base.

What is an Artificial Grass Sub-base?

Within the fake grass industry, the ‘artificial grass base’ is known as the layer of crushed stone- often a combination of Type 1/MOT (50-70mm)  and Granite Dust (20-30mm)- which is installed on top of the original ground before installing the artificial grass.

What is the Best Base to Use for Artificial Grass?


When it comes to knowing what to use for your new synthetic lawn sub-base, it’s straightforward. Two products can be used for this and its Type 1/MOT and/or Granite Dust.

Type 1/MOT will provide a substantial base as it often contains stones that are 40mm-0mm allowing you to create a solid, compact base while still allowing water to drain through. 

If a pet will be using the lawn or your garden has any drainage issues we would recommend installing a sub-base consisting of mainly granite dust as this will allow liquids to drain from the surface of your lawn and through to the subsoil quickly.

Do I need to Install Underlay for my Artificial Grass?

When it comes to Underlay or Geotextile Membrane, we highly recommend this as it is placed directly beneath the sub-base to prevent weed growth.

What should be the Depth for the Sub base


For domestic applications, we recommend a minimum depth of 50mm.

For commercial or public use, such as artificial grass at schools, playgrounds, offices and shops or an area with a very high volume of footfall we recommend installing a sub-base of between 70mm to 100mm.

Artificial grass on Concrete / Soil / Decking


If you are installing artificial grass to a sound, existing surface, such as concrete or decking, then a sub-base won’t be necessary, as the existing surface will provide sufficient structural support.

If you are replacing a real grass lawn, then you should always install a sub-base. You cannot lay fake grass on the soil.


How do I Level My Sub-base to make it flat?

When it comes to leveling your sub-base, you must start by dropping it to its correct depth all over the required lawn area. This is dependant on existing ground conditions- please refer to our installation guidelines.

Once this is done, you will need to compact the sub-base to make sure it is level. You will need a vibrating plate compactor, which can be hired from your local tool hire shop.

To ensure you have a level surface, guide the plate compactor both up and down, and from side to side, across the entire surface.