Why People Do This
A rug over carpet can visually separate a living room into a seating zone, add pattern or color without replacing the whole carpet, or simply give a room a finished look without a full flooring project.
What to Use Underneath
Skip a standard rug pad here. Most rug pads are designed to grip a hard floor, and on top of carpet they can actually make things less stable, not more. Instead, look for a rug gripper pad made specifically for carpet-on-carpet use, or double-sided carpet tape at the corners and edges for smaller rugs. Consult our rug pad guide for more rug pad questions.
What Size Works Best
The same room sizing rules apply as a rug on a hard floor. A rug that is too small will look like an afterthought. For a seating area, make sure at least the front legs of your furniture land on the rug.
What to Avoid
Avoid high-pile rugs over high-pile carpet. Two thick piles stacked on each other create an unstable, slightly bouncy feel underfoot and make the rug more likely to bunch or shift. A flatweave or low-pile rug over carpet sits much more securely.
Common Mistakes
The most common issue is not the rug itself, but rather skipping the carpet-specific gripper pad and using a standard one instead, which leads to sliding and bunching within the first few weeks.