How to Keep a Split King Bed Together: 7 Proven Methods

A standard king bed frame acts as a container, keeping both bases within a defined boundary. The side rails prevent lateral drift, and the headboard and footboard add additional stability.

Best for: New purchases — buy the frame at the same time as your adjustable bases.

Cost: $200-$600 for a platform-style king frame.

Place rubber non-slip pads (like furniture gripper pads) under each leg or along the bottom of each base. This creates friction against the floor and prevents the bases from sliding when the motors activate.

Best for: Hardwood and tile floors where sliding is worst.

Cost: $10-$25 for a pack of furniture gripper pads.

A bed bridge is a foam wedge that sits between or on top of the two mattresses, creating a smooth surface across the gap. While it doesn't prevent separation by itself, it eliminates the uncomfortable crack you feel when sleeping in the middle. Use this in combination with other methods.

Best for: Couples who sleep close together and feel the center gap.

Cost: $20-$40 on Amazon.

Metal connector bars bolt to both bases, physically locking them together. Some brands sell proprietary connector kits, and universal options are available on Amazon. Velcro straps are a less rigid alternative that allows slight movement while preventing full separation.

Best for: People who want a permanent, secure connection.

Cost: $15-$50.

If your bed is against a wall, push the non-wall side tight against the wall. Only one base can drift (away from the wall), which cuts the problem in half. Combine with non-slip pads on the outer base for a simple, free solution.

Best for: Bedrooms where the bed is in a corner or against a wall.

Cost: Free.

Place a king-size mattress topper across both Twin XL mattresses. The topper covers the gap and adds weight that holds both sides together. A 3-inch memory foam topper works best — it's heavy enough to resist shifting while adding comfort.

Best for: Couples who don't use the adjustable feature every night.

Cost: $80-$200 for a quality king topper.

Note: The topper may bunch up when bases are adjusted, so remove it before adjusting.

Cut a pool noodle in half lengthwise and place it between the two mattresses at the base level. It acts as a soft bumper that prevents the bases from drifting apart. It's not the most elegant solution, but it works surprisingly well for the price.

Best for: Budget-friendly temporary fix.

Cost: $2-$5.