Do I really need new underlay when purchasing a new carpet? Simple answer, YES! You may think it’s a sales trick or even want to save a few pounds but there are genuine reasons why you should put down new underlay when buying a new carpet. For instance, did you know that a good quality underlay prolongs the life of your carpet because it cushions the impact of foot traffic, as well as giving added comfort? Or that it helps to insulate the home? And even helps to reduce noise and sound?