Rodents are known to ruin vapor barriers, crawl space vents, pull down insulation, and leave foul odors inside the crawl space. Over time, rodents will start chewing through your floor and carpeting. They also nest in the insulation in the attic, chew through walls, and leave droppings everywhere. We kill rodents fast with our rodent poisons. Trapping is one of the most failed attempts for rodent control.