Generally, there are four primary things that will void most bedding manufacturer’s warranties. This list is not all inclusive and you must read the warranty information that comes with your new sleep set as every manufacturer warrants their products differently and different levels within one manufacturer’s assortment will have varying warranties.
1) You must have a manufacturer approved box spring/foundation. That is the box spring that is designed to go with the mattress or an approved platform bed that cannot use a box spring.
2) You must have proper center supports running side to side under the center of the mattress set with feet to the floor to prevent sagging.
3) You must have a waterproof and stain proof mattress protector. Any type of stain on a mattress will void the manufacturer’s warranty without exception.
4) You cannot abuse the mattress set. It is not a trampoline and will not perform like one. If abuse is evident, the manufacturer will not warrant the mattress set.