If you've flipped on the basement light in your Chatham home and watched a small, mottled gray insect race behind the water heater, you may have met a firebrat. Firebrats are close relatives of silverfish, and they look and act a lot alike. The big difference is where they live. Silverfish like cool, damp places. Firebrats like it hot. Below, we'll explain what firebrats are, why they settle in near your furnace and what it actually takes to get rid of them. If you'd rather hand it off, our silverfish control service covers firebrats too.
What Firebrats Are
Firebrats are small, wingless insects, usually about half an inch long. Their bodies are flat and shaped like a teardrop, wide at the head and tapering toward the tail. They're gray or brownish with a mottled, speckled look, where silverfish tend to be a more even silver. Both have long antennae up front and three long, thin tails at the back.
They're fast runners and they're active at night. During the day they hide in cracks, behind appliances, under insulation and inside wall voids. Most people only see one when they turn on a light or move a box that's been sitting in a warm corner.
Why They Show Up Near Your Furnace
Firebrats need warmth and humidity to thrive. That's why they turn up in places most other household insects avoid:
- Furnace and boiler rooms. The heat and the cracks around equipment give them shelter all year.
- Water heater closets and laundry areas. Warm pipes, dryer heat and moisture make a comfortable home.
- Around ovens and dishwashers. Kitchens offer heat, crumbs and gaps behind cabinets.
- Near hot pipes and chimneys. They follow heating lines and flues through walls and between floors.
- Warm attics. In summer, an attic can be hot enough to suit them, especially if boxes of paper are stored there.
Once they find a warm spot with food nearby, they stay. They can live for a long time and keep laying eggs in hidden cracks, so a few firebrats can slowly turn into a steady population.
What Firebrats Eat And Damage
Firebrats feed on starches, sugars and protein. Inside a home, that means flour, cereal, pasta, crumbs and pet food. It also means things you might not think of as food: paper, cardboard, book bindings, wallpaper paste, glue, photographs and starched or soiled fabrics like cotton, linen and rayon.
The damage is usually small but annoying. Look for irregular holes or scraped surfaces on paper, yellowish stains on fabric, tiny pepper-like droppings and shed skins on shelves. Stored documents, old books and cardboard boxes near the furnace are often hit first.
Are Firebrats Harmful?
No, not to people or pets. Firebrats don't bite, don't sting and aren't known to spread disease. The real concerns are the damage to paper and fabric, and what their presence says about your home. A firebrat problem usually points to heat and humidity building up somewhere, plus gaps and clutter they can hide in.
How To Get Rid Of Firebrats
Spraying the ones you see won't solve the problem, because most of them are hiding. Getting rid of firebrats means changing the conditions that keep them alive.
- Lower the humidity. Run a dehumidifier in the basement, fix dripping pipes and make sure your dryer vents outdoors with a tight connection.
- Insulate hot pipes. Insulating exposed heating and hot water lines cuts down the warm runways they travel along.
- Seal cracks and gaps. Caulk gaps around baseboards, pipe openings and utility penetrations near heating equipment. Our home pest proofing team can help with hard-to-reach spots.
- Clear out paper and cardboard. Move boxes, old magazines and stored papers away from the furnace room. Switch to sealed plastic bins.
- Store food tightly. Keep flour, cereal, pasta and pet food in airtight containers and clean up crumbs behind appliances.
- Vacuum regularly. Vacuum cracks, shelves and corners near heat sources to pick up eggs, droppings and food scraps.
Silverfish respond to many of the same steps. If you're seeing them in bathrooms rather than near the furnace, our post on why silverfish love your bathroom explains the difference.
When To Call A Professional
If you've dried things out, sealed up gaps and cleared the clutter but still see firebrats every week, they're likely breeding inside walls, under floors or around equipment you can't easily reach. That's when a professional inspection helps. EcoFusion's NJ DEP-licensed technicians use Integrated Pest Management: we find where firebrats are hiding, treat those areas with EPA-registered eco-safe products and show you which conditions are drawing them in, so they don't come right back.
Firebrats are harmless to your family, but they're stubborn once they've found a warm, humid spot with paper and crumbs nearby. Cut the moisture, seal the cracks, clear the clutter and store food tightly, and most Chatham homeowners will see far fewer of them. If they keep turning up around the furnace or water heater, EcoFusion Pest Control can track them to the source and help you get rid of them for good.