Previously in the Ultimate Guide to Carpenter Ant Removal we learned how to spot them at home and how to locate a nest. Now let’s explore the carpenter ant infestation and what that might looks like.
TLDR;
- Carpenter ants leave behind sawdust-like frass, often found near baseboards, windows, or wood structures
- You may hear faint rustling noises inside walls, especially at night when ants are active
- Large black ants indoors, particularly in kitchens or bathrooms, can signal a nearby nest
- Moist or damaged wood is a prime target for nesting and often where infestations begin
- Trails along walls, ceilings, or exterior siding can help you track where they’re coming from
- Satellite nests may exist, so activity in multiple areas usually means a larger problem
- Early detection and targeting the nest are key to stopping structural damage and repeat activity
Or Summarise this article with.
How To Spot Carpenter Ants at Home
Carpenter ants are usually easy to spot when they appear in a home. These structurally damaging insects are unmistakably large and usually black in colour. The challenge sometimes in identifying and locating carpenter ants is that their nests usually reside in exterior walls of a structure, showing no signs on the inside of a home. It’s always best to have a trained eye properly inspect for carpenter ants.
Check out this image shot from one of our technicians. Much bigger that your standard pavement ant aren’t they?
Image: Major colony of carpenter ants pouring out of a nest during one of Westside Pest Control’s Carpenter Ant Treatments
Where to look for the traces of carpenter ants?
#1 Areas of high moisture
Have you ever had a leak? Or, do you have humidity problems in some parts of your home? Start there.
Bathrooms, basements, dryer rooms, any room that could experience moisture problems. There are a number of other things you can explore if you are trying to located a carpenter ant nest
If you are trying to locate a carpenter ant nest indoors, you could also try following the ant trail, as well as listening closing to the walls – place your ear against the wall and knock, and listen out for a rustling sound.
As their name indicates, carpenter ants are capable of boring into wood doors, windows, trim, cabinets and other wood materials to build a nest. Typically they’ll be located inside of walls, making them very hard to get rid of.
Outside of the home, tree stumps and old, rotting logs are perfect spots for nests and they can also be located under stones too.
#2 Look for Frass
Another clue is the presence of fine sawdust, known as frass. This is created by the ants carving out galleries in which to travel, live, and lay their eggs, and is a very good indicator of the nearby presence of a nest.
Ever see bits of sawdust clinging to cobwebs on the side of your house, or resting on the concrete below the fascia?
Well, bits of sawdust-like material are often an indicator of carpenter ants or termites. It’s called frass, and it’s a surefire way to tell that one of these two pests has invaded your home. Of the two, the termites are the nastiest when it comes to wrecking your home, but carpenter ants can do significant damage as well if left to their own devices for enough time.
Carpenter ants carve out beautiful tunnels in wood, the results is this residue called Frass.
Carpenter Ant spoils (frass) unearthed during a renovation
Commons Signs of a Carpenter Ant Infestation
Carpenter ants in the Metro Vancouver region are generally most active between April and October, although they can groggily appear as early as late January.
#1 Emergence of winged swarmers
Spotting a large number of winged ants inside of your home is a clear sign that a nest exists in your home.
Winged reproductive ants typically swarm in the late spring, early summer but have been known to emerge any time of the year in heated structures. After emergence, the ants mate and the queens burrow into the soil to establish new nests and begin laying more eggs.
If you spot an area with a lot of winged ants in a frenzy, that’s a good sign that thriving colony exists nearby.
#2 Spotting them in winter or early spring
Typically when the weather starts getting nicer, carpenter ants start appearing in the house. At this point, they don’t present themselves outside yet, but as it starts warming up, eventually you’ll be able to see where they’re coming from.
The ant trails (the routes used to travel to food sources) are used most frequented by the worker ants after sunset and through the night, although they can be seen on the trails at all hours of the day.
Spotting winged swarmers at such an early stage in the year is usually an indication that a colony is healthy and well established – a good reason to have a professional address the situation and determine an optimal treatment method.
When are carpenter ants most active?
Carpenter ants follow a pretty predictable schedule once you know what to look for.
- Spring and early summer
This is when colonies expand and you may see winged ants indoors - Evenings and nighttime
Most foraging happens after sunset when things are quiet - Warmer, humid days
Moisture brings them out and makes wood easier to work through
If you’re hearing movement at night or spotting ants after dinner, you’re catching them during peak activity. That’s the best time to track trails and locate where they’re coming from.e winter!
If you battle ants every yearÂ
Many homeowners have ongoing battles with carpenter ants, lasting years.. even decades!
At 10 years, carpenter ants are well-established in a home. There’s probably a parent colony as well as multiple satellite colonies. So even if you find and eliminate one nest, that doesn’t mean you’ve got them all. A single carpenter ant queen can live for 15 years or more(:o), and will lay 70,000 eggs in that time. The battle against carpenter ants can often turn into a grinding war of attrition.
You really need to locate all nests to fully get rid of the problem. In most cases, you’re going to probably need a professional to help with it. Good detection and identification is key here.
Inspect some of that damp rotten wood
Here a Westside Pest Control technician locates a nest under the floorboard of a Surrey home
How do they get in?
Carpenter ants can enter the home a number of ways.
Typically it’s through the basements, roof, bathrooms, really anywhere where moisture has built up possibly from leaky pipes where water has dampened the wood. They also can climb in via cables, shrubs, gutter and power lines, or along tree branches which are in contact with the house.
Check out this video snapped from one of our techs, and watch these ants make their way to work!! :)
Westside Pro Tip
Frass tells a story if you know how to read it.
If you keep finding fresh piles of that sawdust-like material in the same spot, don’t just clean it up and move on.
Mark the area. Check again the next day.
If it reappears, you’re directly below or beside an active nest. That gives you a starting point instead of tearing apart half your wall looking for answers.
The Verdict
Still, there’s a lot you can do to either prevent yourself from getting this problem in the first place, or dealing with it if you do end up sharing your home with these Metro Vancouver pests. And if these ants become too much for you to deal with, don’t worry our ant control technicians are only phone call away.
–> Next up, let’s find out how we treat a carpenter ant nest
Need help getting rid of ants?
Remember, carpenter ants are tricky customers, so if you’re unsure what to do give us a call and one our ant control technicians will help you out.
Westside Pest Control is the no1. Ant Control company in the lower mainland. In addition to carpenter ants, we also treat for Fire Ants and Pavement Ants. If there is a need for professional help with an infestation contact of of the team today on 604-559-9060, we would be happy to help.
FAQs
When do carpenter ants come out?
Carpenter ants become active in early spring as temperatures rise. That’s when colonies start sending out workers to find food and expand. You might first notice them indoors around this time, especially near kitchens or bathrooms. Activity usually continues through summer, with peak movement happening during warm evenings.
What are the most common signs of carpenter ants in house?
Look for frass, which looks like fine sawdust, near wooden structures. You might also hear faint rustling inside walls at night. Large black ants indoors, especially repeatedly in the same area, are another strong clue. If you notice trails along walls or ceilings, they’re usually leading back to a nest nearby.
Why do carpenter ants keep coming back?
If they keep showing up, something in your home is attracting them. Moist or damaged wood is a big one. Even after treatment, if that condition isn’t fixed, new ants can move in. There may also be satellite nests nearby, which means you’re only seeing part of the activity until the main source is handled.
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