Issues to considering during selection of materials 4

• Building materials require energy for extraction and manufacture . 
• Energy is also required to transport material to site , maintain it and finally dispose of it . 
• The total energy used is known as Embodied Energy 
• Energy is mainly produced by burning fossil fuels , therefore associated with global warming and pollution . 
• Secifying low - embodied energy materials is generally desirable . 

1. A substanbtia reduction in the buildings total embodied energy can be made by reducing transport requirement . 
2. Reducing transport energy requires material specifieds to select manufactures located as close as tot he building site . 
3. Maintenance of materials requirews both energy and materials and is associated with similar impacts as the construction ob building through on a smaller scale . 
4. Minimizing requirements for maintenance by designing for durability and longevity helps to reduce the life impacts of materials . 
5. Materials can affect the building users in termns of comfort and health . 

• Building industry in the world is responsible for millions tones of construction and demolition waste disposal every year . 
• Mostly is sent landfill 
• Numerous problems associated with landfill sites , including the use of land , toxic materials leaching into groundwater , emissions of explosive gas and structural instability . 

1. Apporopriate site waste segregation , designing to enable reuse and recycling , and using reclaimed and recycled materials all contribute to diverting waste from landfill and other polluting waste disposal options . 
2. Building design can also encourage recycling of waste disposal by providing appropriate recycling facilities in the building .