How to Lay Rubber Grass Mats: UK Installation Guide 2026

Installing rubber grass mats correctly makes the difference between a surface that lasts 20 years and one that fails within a season. The mats themselves are straightforward to lay — the critical factor is sub-base preparation. This guide walks through every step of a correct installation, from site assessment through to aftercare.

Tools and Materials Required

• Rubber grass mats (see sizing guide for quantity calculation)
• Woven geotextile membrane (if installing over soft or poor ground)
• Type 1 MOT granular sub-base material (if preparing new sub-base)
• Plate compactor (hire, approximately £50/day)
• Steel rake and spade
• String lines and pegs for alignment
• Stanley knife or utility knife for trimming
• Angle grinder with masonry disc (for curved cuts)
• Ground pegs or anchor stakes (for slopes or equestrian use)
• Rubber mallet (for seating interlocking edges)
• Edge strips or bevelled edging mats (for open perimeter edges)

Step 1: Site Assessment

Before ordering, assess the ground conditions:

• Firm ground (clay/loam that does not poach): Mats can be laid directly on prepared grass. Skip to Step 3.
• Soft or waterlogged ground: Sub-base preparation is essential. Proceed to Step 2.
• Sand or gravel: Lay geotextile membrane, then mats directly — loose materials migrate through mat apertures without membrane.
• Heavily poached mud: Excavate completely. Proceed to Step 2.

Prod the ground with a cane or steel rod — if it penetrates more than 100mm under light pressure, sub-base preparation is required.

Step 2: Sub-Base Preparation (for soft ground)

1. Mark out the area using string lines, adding 200mm to each edge for overlap.
2. Excavate to firm ground — typically 150–200mm depth. Remove all mud, roots and organic material.
3. Lay geotextile membrane across the excavated area, lapping up the sides by 200mm. Overlap adjacent sheets by 300mm and pin or staple overlaps together.
4. Fill with Type 1 MOT granular material to within 20mm of finished level (allowing for mat thickness). Spread evenly with a steel rake.
5. Compact in 75mm lifts using a plate compactor — do not try to compact more than 75mm at once. Aim for 95% Proctor density.
6. Check level across the finished sub-base. Acceptable tolerance is ±10mm over a 3m straight edge. Fill and compact any low spots.

Step 3: Preparing Existing Grass (firm ground)

If installing on firm ground without sub-base preparation:

• Mow the grass as short as possible — this allows better initial contact between mat and ground
• Remove all large stones and debris from the surface
• Lightly roll the surface if available to firm any soft spots
• Allow to dry for 24–48 hours after rain before installing if possible

Step 4: Laying the Mats

1. Start from a fixed boundary — a wall, fence, kerb or permanent edge. Never start from the middle of an area.
2. Lay the first row along the fixed boundary, connecting interlocking edges firmly. Use a rubber mallet to seat stubborn connections — do not force with a steel hammer.
3. Work outward in rows, connecting each mat to its neighbour on both long and short edges. Check alignment with your string lines every 3–4 rows.
4. Stagger the joints between rows by half a mat length (250mm) for a stronger, more stable surface — like brickwork bonding.
5. Press down firmly on each mat after connecting to ensure it seats fully on the sub-base. Air pockets beneath mats cause rocking and premature wear.

Step 5: Cutting and Trimming

Trimming rubber grass mats is straightforward with the right tool:

• Straight cuts: Score deeply with a Stanley knife using a straight edge, then snap along the score line. For thick mats (23mm+), make multiple passes with the knife before snapping.
• Curved cuts: Use an angle grinder with a masonry or metal cutting disc. Mark the curve with chalk, cut on the waste side of the line. Wear eye protection.
• Cutting around posts: Mark the post position on the mat using a pencil, drill a pilot hole at the corner of the cutout, and use a jigsaw with a coarse blade.

Step 6: Edging and Securing

Open perimeter edges — where the mat ends without a fixed boundary — must be treated to prevent vehicle tyres, horse hooves or foot traffic snagging the edge and lifting mats:

• Install bevelled edge strips along all open edges — these create a ramp profile that vehicles and hooves ride up rather than catching
• On slopes and equestrian sites, install ground anchor pegs through the mat apertures at 500mm centres along the perimeter
• For temporary event use, heavy-duty cable ties through adjacent mat apertures can pin rows together to prevent spreading

Step 7: Aftercare and Maintenance

• First 4 weeks: Avoid heavy vehicle traffic while grass establishes through the mat apertures if growing season (spring/summer). In autumn/winter installation, use carefully from day one.
• Ongoing: Clear mud, leaves and debris from mat surface to maintain drainage. Pressure wash annually if heavily soiled.
• Check connections: After the first winter, walk the surface and re-seat any connections displaced by frost heave.
• Grass growth: Grass growing through mat apertures can be mown with a rotary mower — avoid cylinder mowers that can snag mat edges.

Frequently Asked Questions

How long does it take to lay rubber grass mats?

Two people can typically lay 50m² per hour on a prepared sub-base. A 200m² car park can be completed in a single day with two workers. Sub-base preparation adds 1–2 days depending on ground conditions and area size.

Do rubber grass mats need to be fixed down?

On flat ground, the weight of the mats (7–14 kg/m² depending on thickness) holds them in place without any fixings. Slopes steeper than 1:10 and equestrian sites benefit from ground anchor pegs. Temporary event installations can be secured with cable ties between adjacent mats.

Can rubber grass mats be laid in wet weather?

Yes, you can install rubber grass mats in wet conditions — they are unaffected by rain. However, avoid installing on soft, waterlogged ground that has not been prepared with a proper sub-base, as the mats will sink and tilt under traffic.

What is the best time of year to install rubber grass mats?

Spring and early summer are ideal — the establishment period for grass growth through the mat coincides with the growing season. Autumn installation is also possible; grass will establish in spring. Winter installation is fine but grass will not grow through the mat until temperatures rise above 6°C.

Ready to order? Visit our Rubber Grass Mats UK guide for product selection, or go straight to the grass mats collection.