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<p>The Green Building Index (GBI) is Malaysia’s system for measuring building sustainability, focusing on energy efficiency, indoor air quality, site management, materials, and water use. Although green roofs are not a specific requirement in the GBI, but is support the goals by improving energy efficiency, air quality, and site sustainability. This study examines the implementation of green roofs in East Coast Malaysia and the contribution to building sustainability. This study also investigates the impact of Roof Thermal Transfer Value (RTTV) on electricity cost reduction. A survey was conducted with engineers and assistant engineers from government agencies, including the Public Works Department and Inland Revenue Board. The results indicate that successful green roof implementation depends on structural strength, effective waterproofing, proper drainage, and selecting plants suitable for the tropical climate. Regular maintenance is also essential to ensure long-term performance. While green roofs offer benefits such as improved air quality and reduced indoor temperatures, high installation and maintenance costs hinder widespread adoption. This study highlights the way green roofs can contribute to achieving GBI goals and enhancing building sustainability if financial and technical challenges are addressed. Furthermore, reducing RTTV lowers heat transfer, decreases cooling demand, and cuts electricity costs by up to 70%, ultimately improving thermal performance, sustainability, and cost savings.</p>

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Green roofs for energy efficiency and GBI compliance: a case study of government buildings in East Coast Malaysia

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • Mohamad Firdaus Mohamad Borhan,
  • Shahnizan Imran Mohd Nazri,
  • Nur Farhayu Ariffin

摘要

The Green Building Index (GBI) is Malaysia’s system for measuring building sustainability, focusing on energy efficiency, indoor air quality, site management, materials, and water use. Although green roofs are not a specific requirement in the GBI, but is support the goals by improving energy efficiency, air quality, and site sustainability. This study examines the implementation of green roofs in East Coast Malaysia and the contribution to building sustainability. This study also investigates the impact of Roof Thermal Transfer Value (RTTV) on electricity cost reduction. A survey was conducted with engineers and assistant engineers from government agencies, including the Public Works Department and Inland Revenue Board. The results indicate that successful green roof implementation depends on structural strength, effective waterproofing, proper drainage, and selecting plants suitable for the tropical climate. Regular maintenance is also essential to ensure long-term performance. While green roofs offer benefits such as improved air quality and reduced indoor temperatures, high installation and maintenance costs hinder widespread adoption. This study highlights the way green roofs can contribute to achieving GBI goals and enhancing building sustainability if financial and technical challenges are addressed. Furthermore, reducing RTTV lowers heat transfer, decreases cooling demand, and cuts electricity costs by up to 70%, ultimately improving thermal performance, sustainability, and cost savings.