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Crawl space insulation is one of those jobs that looks simple from the driveway and turns complicated the moment you get under the house. From outside, it sounds like a straightforward upgrade: add insulation, cut drafts, lower energy bills. Underneath the floor, though, the real story shows up. You find damp soil, sagging fiberglass, plumbing lines sweating in summer, rim joists full of air leaks, and sometimes evidence that mice or rats have been treating the space like a

When rodents leave a crawl space, many homeowners feel a wave of relief. The scratching stops. The droppings seem old. The smell fades a bit. It is tempting to think the problem ended when the animals did. That is rarely how it works. A crawl space can hold the mess long after the rodents are gone. Urine soaks into insulation and wood fibers. Droppings collect along beams, near duct runs, and in the corners where air barely moves. Nesting material gets packed into gap