Certain types of rug pads can damage a wood floor, so you must select the best type to protect your investment. To narrow down your options, avoid rug pads that are designed to go on top of carpet. These pads generally are lined with textured material that is designed to grip. This texture could potentially scratch your hardwood. Also look for real rubber on the bottom of the rug pad, not latex. While latex will not scratch hardwood, it can flake and crumble onto the floor, eventually causing marks.