Polypropylene granules can serve as a drainage layer.
1. Key Advantages
• Excellent drainage performance: Voids between the granules allow water to pass through quickly, preventing water accumulation; ideal for applications such as rooftop gardens.
• High corrosion resistance: Stable in acidic and alkaline environments; resistant to degradation over long-term use.
• Lightweight yet compression-resistant: Reduces structural load while withstanding pressure from above without deforming.
2. Limitations
• Higher cost: More expensive than traditional materials like gravel.
• Risk of floating or shifting: In strong water flows, the lightweight granules can easily wash away or scatter, affecting drainage uniformity.
3. Suitable Applications
Ideal for projects requiring high drainage capacity and having limited structural load-bearing limits-such as lightweight rooftop greening, drainage layers for potted plants, and landscaping projects-though the granules must be secured to prevent shifting.