Modern construction projects include a large variety of new materials, manufactured building components, and complex systems. Today, these elements are carefully planned and designed so as to meet explicitly defined performance requirements, aiming to produce durable structures and buildings that meet a wide spectrum of user and society needs. Aspects affecting the choice of building materials and construction technologies include: strength and integrity over time, fire-safety, moisture safety, climate and acoustic comfort, energy efficiency, durability and sustainability ( green construction ).