Carpenter Ants: Silent DestroyersDr. Jim Fredericks
Thursday, September 6, 2012
The real risks posed by these tiny pests
Did you know that there are more than 700 species of ants in the
United States? In fact, ants are the number one nuisance pest in
the country. Fortunately, most common ant species – like odorous house
ants, pavement ants and Argentine ants
– pose little threat beyond the annoyance of an infestation, but
some ant species – like carpenter ants – can pose serious
What’s the risk?
Of all the ant species, carpenter
ants are one of the most problematic. They can cause serious
property damage to homes and other buildings. Carpenter ants get
their name because they excavate wood in order to build their
nests. Their excavation results in smooth tunnels inside the wood.
Much like termites and other wood destroying insects, this
excavation can compromise the structural soundness of the wood over
Where are they found?
There are nine types of carpenter ants in the U.S. These pests
are most commonly found in cool, damp climates in the northern
regions of the country.
Carpenter ants build their nests in various wood sources,
including tree stumps, fence posts, firewood or landscaping. They
prefer to attack wood that has been wet or damaged as a result of
leaks. Indoors, this means they are often found in damaged window
and doorframes, crawlspaces under roofs, chimneys, sinks and
A mature carpenter ant colony can contain more than 10,000
workers. In large colonies, it is not uncommon to have multiple
nests inside structures as well as outdoors.
Carpenter ants usually gain access to buildings through cracks
around doors and windows, holes for wires, or straight through wet,
damaged wood. They will also crawl along overhead wires, shrubs, or
tree limbs that touch the building far above the ground. Although
carpenter ants first invade wet, decayed wood, they may eventually
build paths through dry, undamaged wood, too.
How do I spot them?
Carpenter ants are larger than most other ant species. They
range in size from one-quarter inch for a worker ant to up to
three-quarters of an inch. They are black or red, or
sometimes a combination of both colors.
Typically, carpenter ants act as “silent destroyers,” quietly
tunneling through wood without any external signs of damage. In
some cases, homeowners may notice wood fragments and sawdust that
fall through cracks the ants have created. Badly damaged wood will
have small openings, like little windows.
How Do I Prevent Them?
Carpenter ants can be destructive, and the damage they cause can
be expensive to repair. The best way to treat this pest is to
prevent them before they ever find a way into your home.
Luckily, there are many things homeowners can do to prevent
carpenter ants. For one, carpenter ants need a constant water
source to survive, so eliminating moisture or standing water on
your property can help to deter them. Consider using a dehumidifier
in crawl spaces, basements and attics that are prone to
Homeowners can also trim tree branches and shrubs away from
their home, as these often provide highways inside for ants and
other pests. In addition, fill any gaps or cracks on the outside of
the home with silicone caulk. Firewood and other wood building
materials should be stored at least 20 feet from your home, and at
least five inches off of the ground.
Most importantly, keep a close eye on your property for signs of
carpenter ants. Inspect wood on your home for the appearance of
small openings or sawdust. And if you suspect you have a
carpenter ant infestation, contact a licensed pest
professional right away. The sooner carpenter ants are treated,
the less serious the damage is likely to be.