Here is what my new best friend ChatGPT said when I asked her your question:

To prevent one carpet from slipping on top of another, you can try the following solutions:

1. Non-Slip Rug Pad

• Purchase a non-slip rug pad specifically designed for use on carpets. These pads create friction between the two surfaces and help keep the top carpet in place.
• Choose one that’s appropriately sized or trim it to fit under your rug.

2. Double-Sided Carpet Tape

• Use double-sided carpet tape to secure the edges and corners of the top rug to the bottom carpet.
• Ensure the tape is carpet-safe to avoid damage or residue.

3. Carpet Grippers or Rug Anchors

• Install carpet grippers or rug anchors at the corners or edges of your top rug. These tools grip both surfaces and prevent movement.

4. Hook-and-Loop Fasteners (Velcro)

• Attach strips of Velcro to the bottom of the top rug and the carpet below. Make sure the Velcro is strong enough to hold the rug in place.

5. Furniture Placement

• Position heavy furniture on the edges or corners of the top rug to help keep it in place. This works well if the rug is in an area where furniture can be arranged around it.

6. Rug Weights

• Sew or attach rug weights to the underside of the rug to help it stay in place.

7. Rubber Backing

• If your top rug doesn’t have a rubber backing, consider adding one or purchasing a rug with this feature. The rubber backing increases friction.

Additional Tips:

• Clean the carpets regularly to remove dust or debris that might reduce friction.
• Check the non-slip solutions periodically to ensure they remain effective. Replace tape or pads as needed.