Norway Rats

How to identify and remove Norway rats.

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Roof Rats
Pest Category
Do They Carry Disease?
Do They Cause Structural Damage?
Cost of Damage
Other Damage?
ducting and or insulation
ducting and or insulation
can also infest furniture and automobiles
anywhere a safe and quiet, harborage can be found

Additional note: A rodent’s teeth never stop growing, thus they constantly have the need to gnaw and chew on objects. As a result. they can do damage to electrical wiring, plumbing fixtures etc… It is important to remove them from a building as soon as possible.

Signs to Look For
Noises at night are a sure sign.
Foraging and building of nests at night is a common habit of most rodents.
Droppings and urine stain in attic and crawlspace insulation as well as smudges caused by rats and mice entering in and out of an opening consistently.
Their fur is rather oily and that oil rubs off when they come in and out of the same opening, eventually leaving a dark colored smudge.
One of the best indicators of a rat and/or mouse infestation is noise.
Scratching, clawing sounds in the late evening and early morning hours. Often times customers hear noises coming from the heat ducting that runs underneath or above the structure.
Both rats and mice tend to make nests in the insulation around the ducting and the floor registers because that area tends to be warmed by the heat from the furnace. Household pets will scratch, stare and sit by floor registers because they can hear the rodent activity. When a pet begins to do this it is a good sign that something is wrong.
Where are they noticed?

Predominantly: Very often noticed in upper parts of structures. Can also be found in crawlspaces.

If Untreated…

Repairs could be anywhere from hundreds to thousands if left untreated. There are possible health concerns related to living conditions for humans as well.


Rats cause damage to a variety of places in your home. They chew through whatever is in their way in order to get to both a warm and dry place. By chewing through insulation and ducting, rats cause your heating bills to rise drastically. They chew through electrical wiring, which can cause electrical fires. Additionally, they chew through furniture, cars, and plumbing fixtures. Which can cause flooding. Another way they can cause damage is from both their droppings and urine stains on both wood and insulation. A rat’s teeth never stop growing. So they are constantly chewing through everything. If a rodent infestation isn’t dealt with, then the possible damage is endless. The cost of the damage that rats cause is very high, so it’s important to take care of the problem right away.


Bird feeders and pet food left outside are a magnet for these animals. A strong rodent control program needs to incorporate the following:

Thorough inspection to determine the type of rodent that is being addressed.
Finding and sealing the holes that rodents are using to enter the structure.
The use of bait and traps and other applicable rodent control measures.
Continuous monitoring of the baiting, trapping and other measures installed, as a deceased rodent is still a possible food source and source of unpleasant odor withing the structure.
Finally, identify and address the conditions that led to the infestation. There are also possible concerns to humans concerning living conditions.
Photo of Damage

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