All mattresses need a firm foundation to last
When purchasing a mattress, you want to make sure it lasts for years to come or a least to the end of the warranty. It is good practice to buy a new foundation/box spring or platform bed for your new mattress. A mattress foundation is like a foundation in a house, if it is not solid and even it will wear quicker or fail to perform as it should. Using an old foundation for a new mattress is not recommended. It may visually look okay but they do wear more than their appearance.
According to eHow, the box spring is the foundation of your mattress. Its main purpose is to help your mattress keep its shape for years to come.
Better Sleep Foundation also agrees that a foundation is just as important as a mattress.
Never put a new mattress on an old foundation (or vice versa).
When buying a new mattress, simply buy a new foundation. They are made to work together and are ideal for helping you get the best night of sleep.
Your foundation may need to be replaced before your mattress. This is when the warranty comes in handy (hopefully you won’t have to pay a dime for your replacement foundation). Make sure you measure your mattress and the bed frame before choosing a box spring replacement. Then decide how tall you want your box spring to be when it is placed in the bed frame. Usually, the Foundations are sold in heights of five or nine inches. Consider purchasing a hypoallergenic cover for your box spring as it will prevent dust mites and bacteria from getting in between your box spring and your mattress. Make sure to look over the warranty of your new box spring and don’t be afraid to return it if you feel you’re not getting proper sleep within your first few nights!