You have more frame and foundation options than you think for your oversized mattress!
Depending on size, some oversized mattresses can fit securely on two smaller-sized foundations put together. For example – a Family King mattress can be used on two Queen-sized foundations, or a Family LX King mattress can be used with two foundations sized for a California King.
Other sizes, such as an Alaskan King, will require a custom foundation. In this case, finding a local craftsperson to make a basic platform foundation may be your best option.
NOTE – you can also choose to use your oversized mattress without a foundation! Mattresses can be placed directly on the floor and will provide the same level of support and function as one placed on a foundation!