Heat Island Impose various effects on surroundinf Environment and climate such as

-Increased Energy Consumption

-Elevated Emissions of Air Pollutants and Greenhouse Gases

-Compromised Human Health and Comfort

-Impaired Water Quality

In order to reduce these impacts LEED has put a credit HEAT ISLAND REDUCTION, the intent of this credit is

to minimize effects on microclimates and human and wildlife habitats by reducing heat islands.

Total No. of Possible Points – (1-2 points)

This credit applies to-

New Construction (1-2 point) ,Core & Shell (1-2 point),Schools (1-2 point),Data Centers (1-2 point),Warehouses & Distribution Centers (1 -2point),Hospitality (1-2point),Retail (1-2 point) & Healthcare (1 point)

Requirements

FOR NC, CS, SCHOOLS, RETAIL, DATA CENTERS, WAREHOUSES & DISTRIBUTION CENTERS, HOSPITALITY, HEALTHCARE

Option 1. Nonroof and Roof (2 points except Healthcare, 1 point Healthcare)

Meet the following criterion:

Area of Nonroof Measures		Area of High- Reflectance Roof		Area of Vegetated Roof
—————	+	——————	+	——————	≥	Total Site Paving Area	+	Total Roof Area
0.5		0.75		0.75

Alternatively, an SRI and SR weighted average approach may be used to calculate compliance.

Use any combination of the following strategies.

Nonroof Measures

• Use the existing plant material or install plants that provide shade over paving areas (including playgrounds) on the site within 10 years of planting. Install vegetated planters. Plants must be in place at the time of occupancy permit and cannot include artificial turf.

• Provide shade with structures covered by energy generation systems, such as solar thermal collectors, photovoltaics, and wind turbines.

• Provide shade with architectural devices or structures.

• Provide shade with vegetated structures.

• Use paving materials with an initial solar reflectance (SR) value of at least 0.33.

• Use an open-grid pavement system (at least 50% unbound).

High-Reflectance Roof

Use roofing materials that have an aged SRI equal to or greater than the values in Table 1.

If aged SRI is not available, the roofing material shall have an initial SRI equal to or greater than the values in Table 1.

Table 1. Minimum solar reflectance index value, by roof slope

	Slope	Initial SRI	Aged SRI
Low-sloped roof	≤ 2:12	82	64
Steep-sloped roof	> 2:12	39	32

Roof area that consists of functional, usable spaces (such as helipads, recreation courts, and areas covered by equipment, solar panels, and appurtenances) may meet the requirements of nonroof measures.

Vegetated Roof

Install a vegetated roof using native or adapted plant species.

OR

Option 2. Parking under Cover (1 point)

Place a minimum of 75% of parking spaces under cover. Any roof used to shade or cover parking must

(1) have a three-year aged SRI of at least 32 (if three-year aged value information is not available, use materials with an initial SRI of at least 39 at installation),

(2) be a vegetated roof, or

(3) be covered by energy generation systems, such as solar thermal collectors, photovoltaics, and wind turbines.

The credit calculations must include all existing and new off-street parking spaces that are leased or owned by the project, including parking that is outside the project boundary but is used by the project. On- street parking in public rights-of-way is excluded from these calculations.