Using the mattress without a foundation or box spring requires a support system like a platform bed:

Support systems with slats spaced LESS than 2” apart must include a head-to-foot lengthwise center support with at least one centrally-located leg that extends to the floor

Support systems with slats spaced MORE than 2” apart must include a solid wooden, plastic, or similarly rigid surface between the mattress and slats to bridge the spaces, and a head-to-foot lengthwise center support with at least one centrally-located leg that extends to the floor

Any support system that does not fit within the above descriptions must at minimum provide a rigid platform with adequately distributed supports extending to the floor. Determination of whether a support system is adequate is at the sole discretion of Serta Simmons Bedding.

The use of any platform that lacks support as outlined above may result in damage to your mattress that will void your warranty. 

For all adjustable foundations, please see the owner’s manual for required safety, support, and warranty coverage.

There is no weight limit for these mattresses. The frame/support underneath the mattress would yield prior to damage occurring to the mattress.