Materials / Green (Vegetated) Roof
Green (Vegetated) Roof
single-plyA low-slope roof assembly in which a waterproofing membrane is overlaid with drainage, growing medium, and living vegetation. Classified as extensive (shallow, low-maintenance) or intensive (deep, garden-like). The roofing family is defined by the single-ply or modified-bitumen membrane beneath the planting.
Category family
single-ply
Typical lifespan
30–50 years
Typical wind resistance
ballasted assemblies resist uplift; varies by design
Typical fire rating
Class A
Weight per square
1500–5000 lbs
Cost band
$$$$
Slope suitability
low
Typical warranty
20–30 years
Pros
- stormwater retention and runoff reduction
- insulation and urban heat-island mitigation
- protects the membrane from UV, extending its life
- habitat and amenity space
Cons
- very heavy saturated loads require structural engineering
- higher installed and maintenance cost
- leak detection is more complex
Colorado notes
- hail_performance: the growing medium and vegetation shield the membrane from hail impact
- altitude_uv: plant selection must suit Colorado's semi-arid, high-UV climate
Related guides
Sources
- greenroofs.org verified 2026-07-12