A green roof is a building roof that is partially or completely covered with vegetation (usually grown on a waterproof membrane). Unlike a conventional roof, a green roof incorporates plants, growing medium, and drainage systems, which contribute to environmental, energy, and aesthetic benefits.

Green roofs offer numerous benefits: they reduce the urban heat island effect, improve air quality, manage stormwater (reducing runoff), enhance energy efficiency (due to insulation), extend the roof's lifespan, and create habitats for biodiversity.

Extensive green roofs are thin and lightweight, with a soil layer typically 5-15 cm deep, and are planted with drought-tolerant, low-maintenance plants (e.g., sedums). Intensive green roofs have a deeper soil layer (over 15 cm) and can support a wider variety of plants, including shrubs and small trees, often serving as accessible gardens. They require more maintenance.

A green roof consists of several layers, starting from the building's structure: a waterproofing membrane, a root barrier layer, a drainage layer (often with water retention elements), a filter layer, and finally, the growing medium layer and vegetation.

• The choice depends on the roof type (extensive or intensive) and climate. For extensive roofs, sedums, succulents, and certain grasses are suitable. On intensive roofs, you can plant perennials, shrubs, ornamental grasses, and even small trees that are adapted to roof conditions.

The level of maintenance depends on the roof type. Extensive roofs require minimal maintenance: weeding and inspection 1-2 times a year. Intensive roofs require more care, similar to garden maintenance: regular watering, fertilizing, pruning, and pest/disease control.

Not always. Green roof construction requires that the building's structure can withstand the additional load (weight of soil, plants, water). A structural assessment by an engineer is necessary. Additionally, the roof's slope is also important—excessively steep roofs can create issues.

The initial installation cost of a green roof is typically higher than that of a conventional roof. However, in the long run, green roofs can save money due to lower energy costs, extended roof lifespan, and reduced stormwater management expenses.

Green roofs create habitats and food sources in urban environments for birds, insects (especially pollinators like bees and butterflies), and small animals. They act as "green bridges", connecting isolated natural areas and supporting the urban ecosystem.

Yes, in many cases, special permits and compliance with local building codes and regulations may be required. This particularly applies to requirements for structural integrity, waterproofing, and drainage systems. Consult with local authorities and professionals before starting the project.