new carpet should have new underlay, as it is an integral part of a good floor. A good quality underlay will prevent your carpet from slipping and rucking and give added underfoot comfort.Underlay cushions the carpet against footfall and also acts as a heat and sound insulation.Good quality underlay will prolong the life of your carpet by at least 40 percent.
Underlay is placed underneath carpet to provide comfort, to reduce wear on the carpet and also to insulate sound and heat. Currently, there are three types of Underlay available in the market today, they are Crushed Crumb Rubber Underlay, Rubber Waffle Underlay and PU Foam.
Underlay is very important for when you are having your new carpet. Underlay provides added softness to the carpet, improves sound insulation, improves heat insulation, absorbs the weight of furniture to prevent marks and helps against general wear and tear. I think its safe to say, underlay is definately a helpful thing to have!