Rats leave dirt, waste and grease in their paths. They are also capable of chewing through wood and concrete. Rat holes are both unsightly and dangerous; not only do they allow entry to a variety of other pests, but they also can lead to short-circuit fires if the rats gnaw on electrical wires..
Locating rat holes may prove more difficult than expected. Holes should be sought with particular attention to locations where bricks, wood or tile may have rotted. Rat holes may exist between floorboards or in unlikely places, such as closets. Cluttered areas tend to attract rodents, as well as places surrounding water pipes. Rats may also use gas pipe entry holes behind stoves.
Sealing all possible entry points will reduce the chance a rat infestation will take place within your home. In the event of an existing rat population, plugging holes caused by these rodents may be one step in an effective extermination plan. Holes should be sealed with concrete or metal. If you discover evidence of a rat, you should contact your local pest control professional to help create a custom plan for treating rats.