Technically, yes—you can put both box springs and foundations directly on the floor, but it’s generally better to avoid doing this. Since airflow underneath the bed is eliminated, moisture can build up inside the base and mattress, which might make your mattress break down faster. Leaving your bed base on the floor also allows for dust and dirt buildup. Not to mention it makes it easier for any pests scurrying around on the floor to crawl right into bed with you. If you want to avoid dust, moisture, and six-legged bedfellows, it’s best to have a platform or a bed frame.