What size foam would be put into a soft side cal king water bed instead of the bladders?

I want to buy a plushtop soft side cal king waterbed.  I want to substitute the bladders for foam.  Does anyone know the dimensions or if a queen or two twins would fit inside.  Thanks

Comments

[canucksgirl]

Waterbed's vary in size and it won't necessarily work with a standard mattress. Your best bet is to measure out the inside of the frame. Get the length and width, and compare to standard mattress sizes. Chances are you'll have to simply purchase a sheet of foam (from a specialty store), and cover it with a custom mattress-type protector. You may still be able to re-use the sheets, but consider all this carefully before you do anything. It may be a whole lot cheaper for you to purchase a new bed frame and a regular size mattress.