As discussed in our previous blog, there are multiple rating agencies for Green Buildings in India.We have deep dived into IGBC Ratings, now it’s time to discuss GRIHA.Green Rating for Integrated Habitat Assessment (GRIHA),is India's pioneering green building rating system,stands out for its holistic evaluation of resource efficiency, ecological preservation, and occupant well-being.It is developed by The Energy and Resources Institute (TERI) in collaboration with the Ministry of New and Renewable Energy.GRIHA assesses projects across 34 criteria, awarding star ratings from one to five based on
their alignment with sustainable principles.
One powerful yet often overlooked tool for boosting your GRIHA rating? Cool roofs. These simple upgrades make buildings cooler, cut energy bills, and help rack up those valuable certification points.
What Exactly Are Cool Roofs?
Traditional dark roofs soak up sunlight like a sponge, pushing surface temps above 60°C and turning interiors into ovens. Cool roofs flip the dynamics—they reflect sunlight and release heat quickly.
- Key features: High solar reflectance (85%) and thermal emittance (75%+), achieved with white coatings, reflective tiles, or green layers.
- Why they're popular in India: Hot climates mean big cooling demands; cool roofs cut that load by 10-30%.
- Affordability: Installation often cheap, with payback in 2-3 years through lower energy use.
They're a passive solution and align perfectly with GRIHA's push for practical,measurable sustainability.
How Cool Roofs Boost GRIHA Certification: Key Criteria Explained
GRIHA evaluates projects on 34 criteria, awarding 1-5 stars for excellence. Cool roofs contribute in several areas, especially in newer versions like GRIHA v2019.
1. Reducing the Urban Heat Island Effect.
Dense urban areas trap heat, raising city temps by several degrees. GRIHA encourages high-reflectance surfaces to fight this.
- Cool roof role: Apply coatings or materials with SRI >0.5 to earn credits—often 1-2 points for effective coverage.
- Pro move: Combine with shading or vegetation for extra gains.
2. Enhancing Energy Efficiency
Cool roofs act as a natural barrier against heat gain,decreasing the load on air conditioning.
- Points potential: 1-5 credits depending on demonstrated savings and building type.
- Requirements: Reflectance ≥0.65 and emittance ≥0.75—backed by material test reports.
Additional Contributions
They support better thermal comfort, sustainable materials, and overall envelope performance.
|
GRIHA Criterion |
Cool Roof Impact |
Points You Can Earn |
|
Heat Island Reduction |
Lowers ambient temps with high-SRI surfaces |
1-2 |
|
Energy Optimization |
Cuts cooling loads by 10-30% |
1-5 (performance-based) |
|
Building Envelope/Other |
Improves insulation and comfort |
Up to 4 (combined) |
For submission, prepare site plans, SRI calculations, product datasheets, and photos. GRIHA evaluators value cleardocumentation.
Real-World Benefits: Why Cool Roofs Pay Off in GRIHA Projects
Beyond points, cool roofs deliver tangible wins for Indian buildings.
- Energy savings: Reduce indoor temps by 2-5°C, trimming cooling costs by 15-25%.
- Environmental gains: Lower GHG emissions, combat urban warming (city-wide drops of 1-2°C possible), and support net-zero targets.
- Health perks: Improved indoor comfort, reduced heat stress, and better air quality in hot seasons.
- Economic edge: Quick ROI, plus certified buildings often command higher rents or sales value.
Many projects use GRIHA-approved high-SRI paints or tiles for easy compliance.
Implementation Tips: Getting Cool Roofs Right
- Evaluate your roof: see if it requires treatment before paint application.Check drainage, moss build up, before commencing work.
- Choose certified products: Opt for GRIHA-listed options with verified SRI values.
- Plan early: Integrate during design for best results, double coat of high SRI paint is recommended.
- Maintain properly: Regular gentle cleaning preserves reflectivity.Wash the roof post monsoon and early spring to avoid dust build up.
- Seek guidance: Check GRIHA workshops or resources for best practices.
Case Studies: Cool Roofs Delivering in Indian Green Buildings
- Southern India offices:in Kerala and Tamil Nadu, High-SRI coatings and terrace gardens led to strong energy reductions and GRIHA stars.
- Government and commercial retrofits: Pilots in cities like Hyderabad and others showed 10-19% cooling savings.
- Nationwide examples: Projects using reflective finishes earned points in heat island and energy criteria, with some achieving 4-5 star ratings.