Foundations at Mattress Overstock
Mattress Foundations & Box Springs
Pick the pieces and the drawing adds up your bed's height, to scale.
Build your bed, to scale
30½ inches
floor to the top of the mattress
7½ in. Universal (your measurement) + 9 in. Sealy + 14 in. mattress
Drawn to scale from the makers' published sizes. Sheets, a protector or a topper add a little. †
From above
- Seen from above at the size you picked. Foundation sizes are the ones Sealy and Stearns & Foster publish. †
- Queen and King need a center support. Sealy and Tempur-Pedic warranties ask for at least 5 legs, one of them in the middle. Stearns & Foster asks for a rigid bridge bar with at least 5 legs. †
- Sealy and Tempur-Pedic ask for 4 legs under a Twin or Full. †
- A King foundation comes as two Twin XL halves, each 38 by 79 in. Sealy and Stearns & Foster ship them that way for easier delivery. †
- Malouf's rail frames are 70 in. long, shorter than the 74 or 79 in. foundation that sits on them. †
- The Rise LT carries the mattress by itself. Malouf says no box spring is needed. †
- This frame widens only to 60 in. For a King, pick the Universal. †
Side by side, at your size.
Each price is for Queen.
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Jamison
Jamison Box Springs
Height not published
Jamison calls it a box spring on its own warranty form.
- Height
- Height not published
- What sets it apart
- Jamison publishes no height or build details for it. Its warranty form asks for a frame with a center support that reaches the floor. †
- Sizes
- Twin, Full, Queen, King (two Twin XL halves)
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Sealy
Sealy SMB 9" Box Spring
9 in. tall
Our listing says box spring. Sealy's current 9 in. base is a flat foundation of wood and steel wire, with no springs.
- Height
- 9 in. tall
- What sets it apart
- Sealy's help center says a traditional box spring will void its mattress warranty. Sealy also makes a 5 in. version, which we don't stock. †
- Sizes
- Twin, Twin XL, Full, Queen, King (two Twin XL halves)
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Stearns & Foster
Stearns and Foster 9" Foundation
9 in. tall
A flat, stationary foundation of high-grade wood with a steel wire support structure.
- Height
- 9 in. tall
- What sets it apart
- 10-year limited warranty. The Queen weighs 48 lb, the King 70 lb in two 35 lb halves. A 5 in. version exists; we stock the 9 in. †
- Sizes
- Twin XL, Full, Queen, King (two Twin XL halves)
Which piece do you need?
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Bed frame
Lifts the bed off the floor. A rail frame holds a foundation. A platform like the Rise LT holds the mattress by itself.
See bed frames -
Foundation
A flat, rigid base with no springs. Sealy and Stearns & Foster build theirs from wood and steel wire. A rail frame needs one. A platform does not.
Build it above -
Box spring
The older base, built with coils that give. Sealy says a traditional box spring voids its mattress warranty. Many stores, ours included, still use the name for flat foundations.
See what we carry -
Adjustable base
Takes the place of the frame and the foundation, and lifts the head and feet. The mattress goes right on it.
See adjustable bases
Where these numbers come from
Sealy, StableSupport Foundation: 9 in. and 5 in. profiles; sizes Twin 74 by 38, Twin Long 79 by 38, Full 74 by 53, Queen 79 by 60, King two pieces of 79 by 38 in.
Sealy help center: flat foundations are "made from high-grade wood, with a support structure constructed from high-gauge steel wire"; "Using a traditional box spring will void your warranty."
Stearns & Foster, Flat Foundations: 9 in. and 5 in. profiles, the same sizes, weights by size, 10-year limited warranty; help center: wood with a high-gauge steel wire support structure.
Center support: Sealy warranty, Tempur-Pedic warranty, Stearns & Foster warranty.
Malouf, Highrise LT Bed Frame: 14 in. profile, 2,000 lb capacity, no box spring needed. 13 in. of clearance: Malouf 2019 catalog, page 181.
Malouf, Adjustable Bed Frame (model numbers ST5033GL and ST6633GL, now MA5033GL and MA6633GL): seven legs and a 1.5 in. center support for Queen and Full, 38 to 60 in. wide; the Universal has nine legs, a 2.5 in. double-rail center support, 38 to 76 in. wide; both 70 in. long (Malouf product pages as archived in January 2021).
Jamison: the warranty claim form on jamisonbedding.com calls the base a box spring and asks for a frame with center support that reaches the floor. Mattress heights in the quick picks come from each mattress listing on this site.
Buy it from people you can actually visit
- Free local delivery¹ To your home across Central & Eastern Kentucky.
- Free setup¹ We place and set up your new bed in the room.
- Free old-mattress haul-away³ The old one goes out the same day the new one comes in.
Independently owned in Kentucky since 2012. Walk in any day (no appointment) and someone who actually knows the floor will help you find the right fit.
