The call usually comes after a few nights of scratching overhead. By then the question people ask is how to catch what is up there — but that is the second question. The first is how it got in, because until that is answered you are managing a problem rather than ending it.
Mice or rats?
This matters, because the two need different traps, different placement and different exclusion work. The most reliable thing you can assess yourself is dropping size.
- House mice — droppings roughly the size of a grain of rice, pointed at the ends. Mice are curious and investigate new objects readily, which makes trapping comparatively straightforward. They can pass through a gap around a quarter of an inch.
- Roof rats — droppings closer to the size of a raisin, with blunter ends. As the name suggests they are excellent climbers and typically enter high, using tree limbs, fences and utility lines to reach the roofline. They are common across DFW, particularly in older neighbourhoods with mature tree cover.
- Norway rats — larger still, and lower-dwelling. More associated with crawlspaces, sewers and ground-level entry than attics.
Roof rats are the ones most often found in North Texas attics, and they are also the reason tree limbs matter so much. A branch touching the roof is a bridge.
Chewed wiring is not just a pest problem. Rodents gnaw continuously to manage incisor growth, and wiring insulation is a frequent target. If you find chewed wiring, raise it as a priority — it carries a fire risk independent of the infestation.
The signs
- Noise, and when it happens. Scratching or scurrying overhead at night is the classic sign. Daytime activity can suggest a larger population. Where you hear it matters too — attic and ceiling points to roof rats, inside walls can be either, under the floor suggests a crawlspace entry.
- Droppings, concentrated along walls and in insulation. Rodents travel the same routes repeatedly, so droppings cluster along runs rather than scattering evenly.
- Gnaw marks on wood, packaging, wiring or pipe insulation.
- Nesting material — shredded paper, fabric or insulation gathered in a corner.
- Rub marks — dark greasy smudges along baseboards and beams where rodents repeatedly brush past.
- A persistent ammonia-like smell, which indicates an established population.
Why trapping alone does not solve it
Traps remove the animals currently inside. They do nothing about the opening those animals used, and that opening is still there afterwards. This is why so many households end up trapping every autumn — the population is replaced through the same route each year.
The work that actually ends a rodent problem is exclusion: physically sealing every opening a rodent can use. That is more demanding than it sounds, because the gaps are small and often in awkward places.
Where they actually get in
On a typical DFW house, the recurring entry points are:
- Roofline junctions — where rooflines of different heights meet, and where fascia meets soffit. These are the classic roof rat entries.
- Gable and soffit vents with damaged or missing screening.
- The garage door seal, especially at the bottom corners where the seal wears first. This is probably the most commonly overlooked gap in a modern house.
- Utility penetrations — where gas, electrical, cable and A/C lines enter the wall. The gap around a refrigerant line set is very often unsealed.
- Weep holes and the brick ledge on brick-veneer homes.
- Plumbing chases under sinks, which connect to wall voids.
- Dryer and bathroom vents with failed or missing dampers.
We have a fuller guide to entry points here, and one specifically on reading the signs in an attic.
What you can check safely
Do not enter an attic or crawlspace you are not comfortable in — rodent droppings and disturbed insulation carry genuine health considerations, and attic footing is easy to misjudge. From ground level and with a torch you can still check:
- Any tree limb within a few feet of the roof
- The garage door seal, particularly the bottom corners
- Soffit and fascia lines for holes or gnaw damage, viewed from outside
- Around the A/C line set where it enters the wall
- Dryer and bathroom vent covers
- Under sinks where pipes pass through the cabinet back
Photograph anything you find. Dropping size, specific location and the condition of the roofline are the three things that most change how a technician approaches the job.
When to get it inspected
Get it looked at if you are hearing noise at night, finding droppings anywhere, or have found chewed wiring. Autumn is the heaviest season in North Texas — the first genuine cold snap pushes rodents indoors, and the calls follow within days.
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