How to Put Supports Under a King-Size Bed
The spaciousness of a king-size bed comes with one serious disadvantage: its wide, heavy, soft mattress often starts to sag sooner than their smaller counterparts. This is especially true if your bed is a gathering place for the whole family. A mattress designed for two adults takes a lot of damage if it has to support two adults, three kids and the family dog. You can shore up the underside of your mattress with a few well-placed cinder blocks. However, a more permanent solution can help distribute the weight and add years to the life of your bed.