The only difference when the rug is going to be used over a carpet is to make sure that the color of the rug complements the color of the carpet.
How to make an area rug not move on carpet.
Rugs that slip and slide on hardwood vinyl or tile floors are a known hazard but you might not expect a rug to slide when it s lying on your carpet and that makes it even more dangerous.
When laying an area rug over a hard surface such as hardwood flooring the biggest concern about the rug s movement is that it will slide around.
One way to keep your rug in place is to anchor it with furniture.
You may be laying down an area rug because you can t stand the color of the existing wall to wall carpet such as in a rental unit but trust us it will look much worse if you just throw down a rug.
When laying the rug over carpet however the concern is more about the rug wrinkling or rippling which presents a big tripping hazard wrinkling will occur because as one area of the rug is stepped on it will shift assuming it is not properly.