1. Need of Acoustic Insulation in Delhi Delhi is the capital of India and it is the political city as well as it has the major industries there. Acoustic insulation is the chief method for controlling sound propagation in buildings. In particular, acoustic insulation has the job of reducing noise transmission between two premises or, in general, between one enclosed area and another. Insulation modifies the difference between acoustic intensity level in the emitting area and acoustic intensity level in the receptor area. It is important to note that when a venue is acoustically conditioned by fitting absorbent materials, what is achieved is to lower noise level but the difference remains same. 2. Noise in buildings can be broken down into 3 categories: Airborne noise; Impact or percussive noise; Noise produced by technical systems. 3. Airborne noise causes a wall to vibrate by means of pressure waves in the air, whereas percussive noise is produced by direct impact of a body on a all or ceiling. Airborne noise disturbs adjoining rooms, whereas percussive noise causes vibrations which spread through materials at a much greater speed than airborne spread and are transmitted through the entire building. An energy efficient building envelope contains both a thermal barrier and an air barrier. The key to an effective thermal barrier is proper installation of quality insulation products. A house should have a continuous layer of insulation around the entire building envelope. Some types of insulation reduce air leakage. 4. Walls are, in general, affected by airborne noise (voices, television sets, etc.) which generate pressure waves in the air to make the walls vibrate. These vibrations are transmitted to the air of near by rooms thus transmitting the sound. Walls are only incidentally affected by impact, whereas floors, in addition to being affected by airborne vibrations, are mainly affected by impact (treading, dragging of furniture, etc.). In this case, impact energy, which translates into floor vibrations, is directly transmitted to the floor, and is much greater than the energy that can be transmitted by air from a sound source. Therefore, contrary to insulation from airborne noise - which can be obtained by increasing the weight of the partition - the problem of insulation against impact noise cannot be solved by increasing the weight of the floor. 5. Acoustic protection should be designed and executed jointly with thermal insulation. The value of a building depends not only on the degree of thermal insulation, but also on the degree of acoustic insulation against noise coming from the outside, noise transmitted between apartments in the same building, and between rooms of the same apartment. 6. U.P. Twiga Fiberglass Limited Address:Twiga House, 3 Community Centre East of Kailash, New Delhi: 110065 Phone: (91 11) 2646 0860 Email:marketing@twigafiber.com Fax: (91 11) 2643 1588/ 2622 6474 Website:http://twigafiber.com/ 7. U.P. Twiga Fiberglass Limited Address:Twiga House, 3 Community Centre East of Kailash, New Delhi: 110065 Phone: (91 11) 2646 0860 Email:marketing@twigafiber.com Fax: (91 11) 2643 1588/ 2622 6474 Website:http://twigafiber.com/