Rats Coming In Off the Water? Whole-Home Rodent Removal & Structural Seal-Up.

Removal is the trapping work that clears the animals living in the structure right now. Exclusion is construction: we find every opening down to about a quarter inch, then close it with gnaw-resistant material so nothing walks back in. Removal on its own leaves the house exactly as open as it was, which is why a property can be trapped clear in the spring and loud again by the fall.

Norway rats — what people here call wharf rats or water rats — live in burrows along bulkheads, canal banks, marsh edges, and dock pilings, and they are strong swimmers. They do not move into a house at random; something pushes them off the shoreline:

• King tides and storm surge flood the burrows they were living in.
• The first hard cold snap sends them looking for a dry, heated void.
• Shoreline construction or bulkhead work collapses an established colony.
• A crawl space with an open vent sits warmer and drier than anything outside it.

Waterfront and low-lying blocks get a second wave of pressure every time one of those happens, which is why sealing the structure matters more here than almost anywhere else.

Sealing an occupied crawl space traps animals inside, so the seal-up is scheduled off the trapping data rather than the calendar. The sequence runs like this:

1. We map the active runways, rub marks, and droppings on the first inspection.
2. Traps go in along those runs and get checked until the catches stop.
3. We re-walk the same runs to confirm no fresh droppings or new gnawing.
4. Only then does the crew close the entry points and finish the seal.

Where a single main entry is still in use, a one-way door lets the last stragglers leave without letting anything back in.

Regularly. Flexible duct running through an attic or crawl space is warm, hollow, and easy to tear open, so rodents nest inside it and leave urine and droppings in the airstream your blower pulls from. Chewed insulation on the duct also costs you the efficiency you paid for. Our sister company Universal Duct Cleaning repairs and sanitizes the affected runs, so the ductwork is dealt with in the same project rather than left for you to arrange later.

It changes where we look and how much of the structure needs closing, so identification comes first. A few tells separate them:

• Droppings: rat droppings are capsule-shaped and up to three quarters of an inch; mouse droppings are pointed and rice-sized.
• Openings: a rat needs a gap about the size of a quarter, a mouse only a dime.
• Location: Norway rats stay low in crawl spaces and burrows, roof rats and mice work the roofline and wall voids.
• Sound: rats are heavy enough to hear thumping and dragging, mice are a lighter scurry.

Mouse work means sealing far more small penetrations, while Norway rat work leans on heavy vent screening, crawl door repair, and burrow treatment around the foundation.