How to Install Grass Carpet on Concrete or Tiles

artificial-grass

Installing Grass Carpet on Concrete or Tiles: Technical Best Practices

Concrete and tiled substrates are among the most common surfaces used for artificial grass installations in Singapore. However, because these materials are non-porous, the primary objective is not simply to bond the grass to the floor. The real challenge is creating a system that allows water to drain efficiently while protecting the underlying waterproof membrane.

Without proper drainage planning, moisture can become trapped beneath the grass, leading to unpleasant odours, mould growth and premature deterioration of the backing system.

Quick Recommendation: The Foundation Strategy

Drainage Mat: A 10mm drainage grid is highly recommended for most concrete and tile installations.
Expansion Gap: Leave approximately 3mm clearance around all perimeter edges.
Adhesive: Use professional moisture-cured polyurethane (PU) adhesive.
Drainage: Ensure floor traps remain accessible and functional.
Subfloor: Must be clean, stable and level.

Why Concrete and Tiles Require Special Attention

Unlike soil-based installations, concrete and tiles do not absorb water.

This means all rainwater must be directed towards drainage outlets.

Common issues include:

Water ponding
Mould growth
Stale water odours
Backing deterioration
Adhesive failure

Proper drainage management is therefore the most important aspect of the installation.

Step 1: Surface Preparation

The substrate must be thoroughly inspected before installation begins.

Check for:

Loose tiles
Cracked screed
Uneven surfaces
Contamination from oil or grease
Poor drainage falls

Tiled surfaces should be cleaned completely before installation.

If grout joints exceed approximately 3mm in depth, a self-levelling compound may be required to create a smoother and more stable surface.

Step 2: Drainage Layer Installation

A drainage mat is one of the most important accessories for artificial grass installed over concrete or tiles.

The drainage layer elevates the turf above the substrate, allowing water to flow beneath the grass rather than becoming trapped.

Benefits include:

Improved drainage performance
Reduced mould risk
Less moisture retention
Longer turf lifespan
Improved hygiene

For many balcony and rooftop projects in Singapore, a drainage mat should be considered an essential component rather than an optional upgrade.

Step 3: Turf Placement and Trimming

Allow the grass to acclimatise before trimming.

Once relaxed, trim the edges carefully using a hooked blade.

Maintain approximately 3mm clearance around walls, columns and fixed structures to accommodate thermal movement.

Step 4: The Seam System

When multiple grass rolls are required, seams must be aligned accurately.

Ensure:

Grass grain direction remains consistent
Seaming tape is centred correctly
PU adhesive is applied evenly
Sufficient curing time is allowed

Poor seam alignment is one of the most noticeable installation defects and can significantly reduce the visual quality of the project.

Step 5: Perimeter Bonding

For most outdoor concrete and tiled installations, perimeter bonding is the preferred approach.

Adhesive is applied around the perimeter while the centre remains free.

This method allows:

Natural thermal expansion
Improved drainage
Reduced bubbling risk
Easier maintenance access

Consultant Insight: The Hidden Risk of Tiles

Many property owners assume tiled surfaces are ideal for artificial grass because they appear flat and stable.

However, grout lines can become moisture traps.

Over time, trapped moisture beneath the turf may accelerate backing deterioration and create hygiene issues.

A drainage mat helps separate the grass from the tile surface and significantly reduces these risks.

For this reason, experienced installers often consider the drainage layer a critical component rather than an optional accessory.

Floor Trap Management

Floor traps must remain fully functional after installation.

Best practices include:

Trimming grass neatly around the drain
Maintaining drainage access
Using drain guards where appropriate
Regular inspection and cleaning

Blocking drainage points can result in severe water accumulation beneath the turf.

Common Installation Mistakes

Mistake	Potential Result
No drainage layer	Trapped moisture
Blocked floor trap	Water ponding
Double-sided tape installation	Bond failure
Full-surface bonding outdoors	Bubbling and expansion issues
No expansion gap	Wrinkling and distortion

Project Case Study: 8 Toh Yi Drive

A balcony installation originally used double-sided tape to secure the grass carpet.

Singapore's humidity quickly weakened the tape, causing sections of the turf to lift within weeks.

The system was replaced with a professional perimeter-bonded installation using PU adhesive and a dedicated drainage layer.

The upgraded solution eliminated stale water odours while significantly improving drainage and long-term durability.

Installation Checklist

Inspect the substrate
Repair damaged tiles if necessary
Verify drainage performance
Install a drainage mat
Allow turf acclimatisation
Trim accurately
Maintain expansion gaps
Use PU adhesive
Keep floor traps accessible

Why Property Owners Choose ANB Artificial Grass

ANB supplies artificial grass solutions for balconies, rooftops, residential homes and commercial projects throughout Singapore.

Professional-grade artificial grass
Drainage mat systems
Balcony and rooftop expertise
Commercial installation experience
Technical consultation support

Explore our Artificial Grass Singapore, browse completed Singapore Projects or request assistance through our Flooring Quotation Singapore page.

Frequently Asked Questions

Should I remove existing tiles before installing artificial grass?

Not necessarily. Existing tiles can often remain in place provided they are stable, level and free from major defects.

Do I need a drainage mat?

For most concrete and tiled installations, a drainage mat is strongly recommended because it improves drainage and reduces moisture-related problems.

Can I use double-sided tape?

Double-sided tape is generally not recommended for permanent outdoor installations due to Singapore's heat and humidity.

Will artificial grass affect my floor trap?

No, provided the grass is trimmed correctly around the drain and access is maintained for cleaning and maintenance.

What adhesive should I use?

Professional moisture-cured polyurethane (PU) adhesive is generally recommended for long-term performance.