Solution 1: The Multi-Tasking Power of Vegetated Roofs

A vegetated (green) roof is perhaps the most versatile feature in the LEED rating system, capable of contributing to several credits across the Sustainable Sites (SS) category:

• Protect or Restore Habitat: For projects with a density of at least 1.5 floor-area ratio (FAR), a vegetated roof using native or adapted plants can count as restored habitat.
• Open Space: If the project meets the 1.5 FAR threshold and the roof is physically accessible, the vegetated area can contribute to the requirement that 25% of outdoor space be vegetated.
• Rainwater Management: Vegetated roofs are a primary Low-Impact Development (LID) strategy, mimicking natural hydrology by capturing and evapotranspiring rain at the source.
• Heat Island Reduction: Along with high-reflectance materials, vegetated roofs are a key strategy to minimize effects on microclimates by reducing the amount of heat absorbed by the building envelope.

Example: Cong Bang Corporation Office

Figure 1 Cong Bang Office Green roof is not just a "nice to have" its a strategic approach to gain multiple LEED scores

Figure 2 Cong Bang Corporation Office Scorecard. Source: USGBC

Solution 2: Integrated Rainwater Harvesting Systems

Capturing rainwater on-site transforms a potential waste product into a valuable resource, allowing a project to stack benefits between the Sustainable Sites and Water Efficiency (WE) categories:

• Rainwater Management: Harvesting system components, such as cisterns, help manage the 95th percentile of regional rainfall events by preventing runoff.
• Outdoor Water Use Reduction: Harvested rainwater can be used for irrigation, helping to achieve a 50% to 100% reduction in potable water demand for the landscape.
• Indoor Water Use Reduction: Reusing captured rainwater for flush fixtures (toilets and urinals) allows projects to exceed the 20% reduction baseline and earn up to 6 points.
• Cooling Tower Water Use: Projects can earn points by using at least 20% recycled nonpotable water, such as harvested rainwater, for cooling tower makeup.

Figure 3 Through integrating the nearby lake in the initial design strategy, ARDOR Green helped our clients to achieve maximum LEED credits from such features

Figure 4 Coca-Cola Tay Ninh Factory Scorecard. Source: USGBC

Solution 3: High-Performance Glazing and the Building Envelope

Strategic window selection and placement provide a "triple win" by linking Energy and Atmosphere (EA) performance with Indoor Environmental Quality (EQ):

• Optimize Energy Performance: By selecting glazing with high thermal resistance (low U-values) and appropriate Solar Heat Gain Coefficients (SHGC), teams reduce heating and cooling loads, which is the first step in achieving the high efficiency needed for up to 18 points.
• Daylight: Clear vision glazing allows natural light to penetrate the floor plate, reducing the need for electrical lighting and reinforcing occupants' circadian rhythms.
• Quality Views: Large areas of transparent glazing provide a direct line of sight to the outdoors for at least 75% of all regularly occupied floor area, a feature proven to increase productivity and attentiveness.

Figure 5 Takashimaya Hanoi Shopping Centre daylight simulation

Figure 6 Takashimaya Hanoi Shopping Centre facade design consists of high quality, high perfomance glazing

Solution 4: Strategic Building Orientation

As a foundational "other strategy," the physical orientation of the building is analyzed during the early discovery phase to maximize natural resources:

• Integrative Process: Teams use "simple box" modeling to assess how massing and orientation affect HVAC sizing and energy consumption.
• Site Assessment: A documented survey of solar exposure and prevailing winds informs the building's placement to support passive energy efficiency.
• Thermal Comfort: Orientation determines the external loads on the building envelope, which are critical for meeting the comfort requirements of ASHRAE Standard 55–2010.
• Renewable Energy: Evaluating solar access ensures the building is positioned to maximize the efficiency of on-site photovoltaic or solar thermal systems.