When it comes to artificial turf, two common questions arise: what items need testing before installation, and can it be laid directly over existing tile surfaces? As a professional in the field, I'll address both concerns with practical guidance.

Quality Testing for Artificial Turf

Before installation, artificial turf must undergo rigorous testing to ensure safety, durability, and performance. Key testing items include:

1. Material Composition Analysis

Testing laboratories examine the chemical makeup of turf fibers, backing materials, and infill (if applicable). This ensures the product meets safety standards and contains no harmful substances.

2. UV Resistance Testing

Artificial grass undergoes accelerated weathering tests to verify its colorfastness and material integrity under prolonged sun exposure. High-quality turf should maintain its appearance for years.

3. Tensile Strength and Tear Resistance

These tests measure how well the turf fibers withstand pulling forces and resist tearing, crucial for areas with heavy foot traffic.

4. Flame Retardancy

Safety certifications require proof that the turf won't easily ignite or spread flames, particularly important for commercial installations.

5. Heavy Metal Content

Especially critical for playgrounds and sports fields, testing ensures lead and other toxic metals stay below regulated thresholds.

6. Permeability Testing

Quality turf must demonstrate proper drainage capabilities, with most products requiring permeability rates exceeding 20 liters per square meter per minute.

7. Pile Height and Density Verification

Independent measurements confirm the product matches manufacturer specifications for fiber length and stitch count.

8. Slip Resistance

Critical for sports applications, testing determines the turf's coefficient of friction under various conditions.

Installing Over Tile Surfaces

Regarding installation over existing tile, while possible, direct installation isn't generally recommended. Here's why:

1. Drainage Concerns

Tile surfaces don't allow proper water permeation. Even with perforated tiles, the underlying mortar layer creates drainage issues that can lead to water pooling and mold growth beneath the turf.

2. Surface Irregularities

Grout lines and potential tile movement can create uneven surfaces that become visible through the turf over time, affecting both appearance and performance.

3. Adhesion Problems

The smooth tile surface makes proper securing of turf edges challenging, potentially creating tripping hazards at seams.

Recommended Installation Method:

For tile surfaces, professionals recommend:

- Removing tiles completely for optimal results

- If removal isn't possible, installing a proper base layer over tiles including:

* 1-2 inch drainage mat

* Compacted gravel sub-base

* Shock-absorbing underlayment (for sports applications)

- Using turf with adequate backing and proper seaming techniques

Maintenance Considerations

When installed over hard surfaces, artificial turf requires:

- More frequent brushing to maintain fiber upright position

- Additional infill material to compensate for harder subsurface

- Closer attention to drainage patterns during rainfall

For residential applications where tile removal isn't feasible, consider hybrid solutions like interlocking turf tiles designed for hard surfaces, which incorporate built-in drainage systems.

Always consult with installation professionals and request product test certificates before purchasing artificial turf. Reputable suppliers should provide recent third-party testing results for all performance claims. For sports applications, verify the turf meets relevant international standards for the specific sport.