Box Spring Differences

Size

• Box springs come in the same size categories as mattresses: twin, extra-long twin, double (also called standard or full), queen, king and California king. However, within these categories, different manufacturers have slight variations in size. For example, a king-size box spring may be anywhere from 76 to 78 inches wide. If you already have a mattress and are buying a box spring for it, or are buying the two pieces separately, make sure the widths are equal.

Height

• The standard box spring is nine inches high. When a standard spring is combined with thicker mattresses, such as those with a cushioned "pillow top," the bed can wind up too high to get in and out of it easily. The solution is a five-inch-high "low profile" box spring. These are constructed to offer the same amount of support for the mattress; the only major difference is the height.

Construction

• Box springs typically use coiled springs. The more coils per square foot, the greater the support the box spring offers the mattress. The gauge of wire used to make the springs affects their durability--the heavier the gauge, the longer the spring will maintain its tension. Some manufacturers arrange the coils so that there are more in the middle of the bed, where support is needed most. As an alternative to coils altogether, Flexsteel brand box springs provide support with steel bands that are bent and held under tension.

Splits

• The box springs for king and California king size mattresses come in two pieces. They're arranged side-by-side on the bed frame, and the mattress is laid on top. This is also an option for queen beds. Split box springs are more durable, as well as easier to maneuver when moving furniture through doorways or up or down stairs.