This also provides an air space between the sub floor and the carpet which allows the carpet to breath. The air space also makes for much deeper vacuuming. When you vacuum the carpet the air space allows more air to be pulled up through the carpet carrying more dust and dirt along with it. The result is more effective each time you vacuum the carpets. This deeper cleaning leaves less dirt behind to cause abrasion and wear out your carpet so the carpet will last longer with carpet padding.
Pile crushing will cause the carpet to look ugly and to start to sag or stretch. Pile crushing is caused when the crushed carpet is walked on all the time and in the same spot or area. So lets say from the kitchen to the sofa is a high traffic area. This is where you will see pile crushing. Hallways are another good example of were crushed pile will show up.
A good carpet padding or under lay will help decrease the amount of pile crushing by allowing the carpet to maintain its pile height so it will stay looking newer longer. It has been proven that under lay will increase the useful life of a carpet by as much as 50%.
Most of the manufactures will not void their warranty on the carpet if there is no under lay. You will also find that most carpet manufacturers require the right under lay or pad to honor their warranty. And most installers will not install unless you agree to have the correct type of carpet padding installed.
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