The VGHolz substrate is a groundbreaking vegetalisation product developed by Demet’Air for roofs and walls. Comprised of over 98 % organic fibres, it is lightweight (~40 kg/m³), biodegradable, and pre‑seeded with a biological seed mix to support urban biodiversity. Delivered in semi‑rigid panels (standard 120×60 cm, ~10 cm thickness), VGHolz is self‑supporting and requires no structural modifications, making it easy to install on most rooftop or wall surfaces. It supports a diversity of horticultural and wild plants and requires minimal maintenance—rainwater generally suffices, with occasional supplemental irrigation under climatic constraints. The system includes a monitoring regime of substrate and ambient parameters (temperature, rainfall, runoff, energy use, thermal sensation), enabling quantification of its environmental and economic benefits. VGHolz delivers natural insulation that reduces energy use by lowering heating and cooling loads, mitigates urban heat islands, enhances air purification, captures rainwater, and fosters urban biodiversity. The technology enables cost‑effective, aesthetically pleasing greening that transforms built environments into resilient, living surfaces while reducing installation complexity and environmental footprint.

• Lightweight and biodegradable substrate
• Pre-seeded with a biological seed mix for urban biodiversity
• Self-supporting semi-rigid panels for easy installation
• Natural insulation reducing energy use and mitigating urban heat islands
• Enhances air purification and captures rainwater
• Cost-effective and aesthetically pleasing greening solution