SS Credit: Heat Island Reduction

The coolest cities are not the ones with more air conditioning—they’re the ones designed to stay cool.

 What is the Intent of this Credit?

The goal is to:

👉 minimize heat island effects

So that we:

• improve microclimate
• protect human health
• reduce impacts on wildlife and ecosystems

🎯 Big Picture

Dark surfaces absorb heat → cities get hotter
LEED reduces this by cooling surfaces

🌍 What is Heat Island Effect?

👉 Urban areas become hotter due to:

• dark roofs
• asphalt pavements
• lack of vegetation

💡 Why It Matters

• increases cooling demand
• worsens air quality
• impacts human comfort and health

📏 Key Concept: SRI (VERY IMPORTANT)

❓ What is SRI?

👉 Solar Reflectance Index

Measures how well a surface:

• reflects solar radiation
• emits heat

📊 Scale

• Black surface → SRI = 0
• White surface → SRI = 100

🎯 Exam Insight

Higher SRI = cooler surface

🧩 Two Compliance Options

✅ Option 1: Non-Roof + Roof Strategies

Goal

👉 Reduce heat from:

• pavements
• roofs
• site surfaces

🌳 Non-Roof Strategies

1. Shading with Vegetation

• trees or plants
• must provide shade within 10 years
• must be installed at occupancy

👉 ❌ Artificial turf does NOT count

2. Vegetated Planters / Structures

• natural shading
• improves microclimate

3. Shading with Energy Systems

• solar panels
• wind turbines
• solar thermal systems

4. Shading Structures (Reflective Materials)

👉 Must meet:

• 3-year aged SR ≥ 0.28
  OR
• initial SR ≥ 0.33

🎯 Memorize These Numbers

5. High-Reflectance Paving

👉 Same thresholds:

• SR ≥ 0.28 (aged)
• SR ≥ 0.33 (initial)

6. Open-Grid Pavement

👉 Must be:

👉 ≥50% pervious

💡 Bonus Insight

👉 Supports:

• Rainwater Management credit

🏢 Roof Strategies

• high-reflectance roofs
• vegetated roofs (green roofs)