Why Carpenter Bees Drill Wood
You’re enjoying a quiet afternoon on your deck when you spot a large, fuzzy bee hovering near the eaves. It looks like a bumblebee, but it’s acting differently—hovering near the wood rather than the flowers.
If you look closer, you might spot the evidence: a perfectly round hole, about the size of a dime, drilled neatly into the timber.
These are carpenter bees. While they are a common sight for homeowners in our area, their behavior can be confusing. Why are they drilling into your home? Are they eating the wood like termites?
At Specter Pest Control, we help homeowners navigate these seasonal pests every year. Here is everything you need to know about why carpenter bees drill and what it means for your property.
The Big Misconception: They Aren’t Eating Your House
When you see sawdust (called frass) piling up under a beam, it’s natural to worry about termites. Termites eat wood to survive. Carpenter bees, however, do not eat wood.
They are drilling to build a nursery.
Carpenter bees are solitary insects. Unlike honeybees that live in massive colonies, a female carpenter bee works alone. She uses her strong jaws to vibrate and bore into the wood to create a safe, weather-proof tunnel.
Once she drills in about an inch, she typically turns 90 degrees to create a long tunnel (or “gallery”) running with the grain of the wood. Inside, she creates individual cells to lay her eggs, leaving a ball of pollen for the larvae to eat when they hatch.
Why Do They Choose Your Wood?
In the wild, carpenter bees look for dead standing trees or fallen logs. In a residential neighborhood, your home is often the next best option. They are opportunistic and look for specific conditions that make drilling easier.
Your home becomes a target if you have:
- Unfinished or Unpainted Wood: Raw wood is easiest for them to sense and penetrate.
- Softwoods: They prefer cedar, redwood, cypress, and pine—the exact woods often used for decks, fences, and siding.
- Weathered Wood: Older wood that has softened slightly from exposure to the elements is a prime candidate.
The Real Risks: It’s Not Just the Holes
If a single bee drills one hole, your deck isn’t going to collapse. The structural damage from one bee is minimal. However, the problem with carpenter bees is rarely limited to a single season.
1. Repeat Visitors
Carpenter bees are creatures of habit. If a female finds a suitable nesting site, her offspring often return to that exact spot the following year. They reuse and expand old tunnels, creating a complex network of hollow galleries. Over several years, this can weaken structural beams and railings.
2. Moisture Issues
Those entrance holes are open pathways for water. Rain and moisture can seep deep into the wood where sealants can’t reach, accelerating rot and decay in your siding or trim.
3. Woodpecker Damage
This is often the most destructive side effect. Woodpeckers love to eat carpenter bee larvae. Because the larvae are hidden deep inside the wood, woodpeckers will peck aggressively to find them, often tearing apart trim boards and siding in the process. The damage caused by a hungry woodpecker is often far worse than the initial hole made by the bee.
Signs You Have a Problem
Because the bees work inside the wood, you can’t always see the extent of the activity. Look for these signs:
- Sawdust Piles: Small mounds of light-colored wood shavings on the floor or ground beneath wooden beams.
- The Hovering Male: Male carpenter bees are territorial and often hover aggressively around the nesting site. (Don’t panic—males cannot sting).
- Staining: Yellowish-brown stains around the entrance holes or running down the wood.
- Audible Scraping: In a quiet moment, you can sometimes hear the female scraping inside the wood.
How to Manage Carpenter Bees
At Specter Pest Control, we believe in effective, modern pest management. We don’t rely on fear or excessive chemicals; we focus on solutions that last.
If you have carpenter bees, here is the best approach:
1. Paint or Varnish
Since these bees prefer raw wood, a fresh coat of paint is one of the best deterrents. Oil-based paints and polyurethane finishes create a hard shell that discourages drilling. Stains are helpful, but paint offers the best protection.
2. Don’t Plug Holes Too Early
It’s tempting to plug the holes with wood putty immediately. However, if you trap the bee inside, she may drill a new exit path, causing more damage. Proper treatment involves handling the active gallery first, then sealing the holes to prevent future re-entry.
3. Call the Professionals
Treating established galleries can be tricky, as you need to reach deep into the tunnel network to be effective.
This is where Specter Pest Control can help. We inspect your property to identify active nests and potential hot spots. We treat the infestation effectively and help you come up with a plan to protect your wood for the long haul.
Get Peace of Mind
Carpenter bees are fascinating, but they are bad tenants. You shouldn’t have to worry about the integrity of your deck or deal with aggressive buzzing when you’re trying to relax outside.
If you are seeing round holes in your eaves or finding piles of sawdust on your porch, let us take a look. We’ll give you an honest assessment and a straightforward solution.
Ready to protect your home?
