4. Conclusion

All these examples of atypical green roofs demonstrate that they are developing while becoming more distinctive. This diversification amplifies and broadens the scope of the beneficial impacts of green roofing: enhanced insulation and, consequently, lower energy consumption, reduced heat island temperatures in summer, CO ₂ sinks, improved quality of the surrounding air, extended life of waterproofing protected from thermal shocks, rainwater regulation... The presence of a green roof reinforces the green value of a building or tertiary building. What's more, the various variations of green roofs – shared roof gardens, urban vegetable gardens, orchards, apiaries... – not only offer relay points for local biodiversity, but are also a source of urban planning innovations, often conducive to encounters and exchanges between residents or employees,...