Hi JeromeJeromeJerome,
If you do decide to choose a Casper mattress you can see their guidelines for a bedframe or foundation here.
You will need either a steel or wooden bedframe and a foundation, or a combination of both such as a platform bed that has a suitable support surface, or a combination metal bedframe/foundation.
This would be fine for a foundation.
I would tend to use a better quality steel bedframe that has 1.5" angle iron (see post #2 here) and I would also tend to choose a bedframe that has center support that goes from head to foot if your foundation has a center beam that goes from head to foot as well (which the Triton does) so that the load bearing points are stronger.
The Casper foundation page suggests that the gaps in this foundation are further apart than their recommended 3" and they suggest using a piece of plywood on top of this although that’s not something I would do myself (see post #10 here) and I would use something like the bed rug instead to provide better ventilation. If you are looking at this type of combination steel platform / bedframe then I would also tend to choose one that has more longitudinal wires to provide better support for the mattress with smaller gaps between the wires (see post #10 here).
I would also keep in mind that a foundation isn’t designed to make a mattress “more comfortable” but to support the mattress with a flat, strong, non flexing, and evenly supportive surface that has the least possible effect on the feel and performance of the mattress.
Ikea doesn’t seem to sell any non flexing slat systems any longer … only slat systems that flex such as the Luroy and the Lonset which wouldn’t be my first choice for a foam mattress. They also don’t have center support legs which are a warranty requirement for some manufacturers although Casper mentions them on their foundation page so I would assume that they are OK with the Ikea bedframe.
Some other suggestions and guidelines are in the first post of this topic.
Phoenix