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Using a box spring or other base for your mattress that is not recommended by the manufacturer can often invalidate your warranty, depending on the brand. Either way, choosing the right kind of support for your mattress is important for optimum support, comfort and durability.
If you purchase a foam mattress from an online brand such as Casper or Purple, you can often purchase a bed base from the company specially made to support your new mattress. But if the mattress company you buy does not offer one (or maybe you don't want the extra costs), there are a few options to set up your new bed without losing your very old bed set-up.  Read more:
What type of platforms work with foam mattresses?
Most companies that make foam mattresses will tell you that a flat, firm surface is the best way to support their mattress. That gives you a few platform options to use:
A platform bed has a flat, even surface and internal supports that support your foam mattress.
A metal or wooden slatted base usually works well for a foam mattress because the slats are evenly distributed and provide firm support for the weight of the mattress. Look at the mattress company website to see what kind of slat base they recommend.
These are the foundations that are usually sold by every mattress manufacturer, specially designed for the mattress.
Nectar is a brand that makes an adjustable bed frame with which you can adjust the bed up and down for optimum comfort. The frame is specially designed for foam mattresses.
Using a box spring for a foam mattress
So why can't you use your old box spring exactly? According to Casper, the slats on older box springs are too far apart to support the weight of a foam mattress, and that lack of support can cause it to sag. Instead, you need a platform with slats that are much closer together.
Casper sells The Foundation, a redesigned box spring that is made to sit on a normal bed frame. It has slats that are closer together to support the Casper mattress.
Some other mattress companies, such as Nectar, suggest that you can actually use to use your existing box spring to support a foam mattress, as long as it is supported by a metal bed frame such as this.
Another important thing to keep in mind is that most companies will encourage you to purchase their brand-specific product to support the mattress, which is of course beneficial to their bottom line.
Even if you prefer to buy another product, it might be worth buying a new platform due to the warranty issue. To be sure, check the warranty on your new mattress and verify with the company that the platform that you decide to use does not invalidate the manufacturer's warranty.
Buying a new base from your mattress company is not the only way to get your new mattress. You can also make a flat surface with a bunkie board or a piece of plywood. Nectar has step-by-step instructions to do that.