Green roof buildup
Waterproofing, protection, drainage, filtration, soil, and planting turn a flat roof into an ecological water-control system.
Incorrect layer order lets roots damage membranes or drainage blockage increase loads. It must be designed as a roof system, not merely a garden.
Extensive roofs use shallow media, while intensive roofs support deeper soil and larger plants. Structural capacity governs the choice.
Public and office projects use green roofs for heat-island reduction and biodiversity, but access and irrigation are essential.
Warranties, leak detection, and root barriers are key specifications. Planting after completion becomes an operational responsibility.
