Benefícios telhado verde
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
~30 kWh/m²/ano
About this calculator
The green roof benefits calculator estimates energy savings and water retention based on roof area. It uses the 30 kWh/m²/year formula to calculate energy reduction from thermal insulation provided by vegetation. Suitable for residential, commercial, or industrial projects, it quantifies environmental impacts like reduced cooling needs and rainwater management.
Water retention is calculated assuming 80% of precipitation is absorbed, preventing runoff and easing drainage systems. Up to 30% energy savings come from reduced air conditioning use. The tool requires only the roof area (in square meters) to generate quantitative results.
Cautions: excludes local climate (heavy rainfall), vegetation type, or planting depth. Results are approximations, as efficiency varies with maintenance and solar exposure. Adjust calculations for regions with prolonged drought or high humidity for more accuracy.
Frequently asked questions
How does the 30 kWh/m²/year formula work?
The formula estimates average energy savings from thermal insulation provided by vegetation, accounting for reduced air conditioning demand.
Can I use the calculator for sloped roofs?
Yes, as long as you input the total flat area. Slope affects vegetation distribution but not the calculation formula.
What factors are not considered?
The tool excludes regional climate, substrate type, or plant species, which directly affect real-world efficiency.
Do I need extra roof data?
Only the area in square meters. For higher accuracy, manually adjust based on solar exposure and geographic location.