Best How to Get Rid of Silverfish in Your Home (2026): Experts P…

Discovering silverfish in your home can be unsettling. These silvery, wingless insects thrive in dark, damp environments and can damage books, wallpaper, and clothing. While they don't bite or spread disease, their presence indicates excess moisture and can lead to property damage. This guide will walk you through a comprehensive plan to get rid of silverfish using DIY methods and targeted products. You'll learn how to identify silverfish, reduce their habitat, remove food sources, and apply treatments like traps and powders. Most steps can be completed in a weekend, and you'll see results within a few weeks with consistent effort.

▸What You'll Need

• •Dehumidifier or moisture meter
• •Sticky traps (silverfish-specific or general insect traps)
• •Diatomaceous earth (food grade)
• •Boric acid powder
• •Cedar shavings or essential oils (e.g., lavender, citrus)
• •A vacuum cleaner with HEPA filter
• •Caulk and weatherstripping (for sealing cracks)
• •Plastic storage containers (for organizing pantry items)
• •Borax (optional, for heavy infestations)

Estimated Time: Weekend: 2-3 days for initial treatment, plus ongoing maintenance Difficulty: beginner

▸Step-by-Step Instructions

Step 1: Confirm It's Silverfish and Not Another Pest

Silverfish are small, wingless insects about ½ to 1 inch long with a teardrop-shaped body covered in silvery scales. They have two long antennae and three bristle-like appendages at the rear. They move in a fish-like wiggling motion and are nocturnal. Check typical hiding spots: bathrooms, basements, attics, and kitchens. Look for yellow stains, small pepper-like feces, or damaged items like books with chewed edges. This step is crucial because different pests require different treatments. If you see other signs like webbing or multiple legs, you may have spiders or cockroaches.

💡 Tips:

• •Use a flashlight to inspect dark corners at night when silverfish are active.
• •Compare with online images to be sure.

⚠️ Warnings:

• •Don't confuse silverfish with firebrats (which prefer warmer areas) – they require similar treatment but have slightly different tolerance to heat.

Step 2: Reduce Humidity and Moisture

Silverfish require high humidity (above 75%) to survive. Use a dehumidifier to keep indoor humidity between 40-50%. Also fix any leaky pipes, faucets, or condensation issues. Improve ventilation in bathrooms and kitchens with exhaust fans. Wipe down sinks and tubs after use. In basements or crawl spaces, consider a vapor barrier. Use a moisture meter to monitor damp spots. Lowering humidity makes your home inhospitable and is the most effective long-term prevention.

💡 Tips:

• •Place a dehumidifier in the dampest room and set it to 50% relative humidity.
• •Run bathroom fans for at least 20 minutes after showering.

⚠️ Warnings:

• •Don't let humidity drop below 30% as that can cause wood cracks; target 40-50%.

Step 3: Eliminate Food Sources

Silverfish eat carbohydrates, proteins, and starches found in paper, glue, textiles, and food crumbs. Store pantry items like flour, sugar, and cereal in airtight plastic or glass containers. Remove stacks of old newspapers, magazines, and cardboard boxes. Vacuum regularly, especially along baseboards, under furniture, and in closets. Clean up crumbs and spills immediately. This reduces their food supply and discourages infestation.

💡 Tips:

• •Use sticky traps to monitor where silverfish are feeding – place them near bookshelves or pantries.
• •Recycle or shred sensitive documents you don't need.

⚠️ Warnings:

• •Avoid leaving pet food out overnight; store it in sealed containers.

Step 4: Set Up Sticky Traps to Monitor and Catch

Sticky traps are nontoxic and help you pinpoint infestation areas and reduce numbers. Place traps along baseboards, under sinks, in corners, and near suspected hiding spots. Check traps weekly and replace when full. Use silverfish-specific traps that have attractant lures, or general insect monitors. Concentrate traps where you've seen activity. This step also helps you evaluate the effectiveness of other treatments.

💡 Tips:

• •Place traps in multiple locations and label them to compare activity.
• •Avoid placing traps in direct sunlight or air vents as that can reduce stickiness.

⚠️ Warnings:

• •Keep traps away from pets and children – they can stick to fur or skin.

Step 5: Apply Diatomaceous Earth (DE) in Key Areas

Food-grade diatomaceous earth is a natural powder made from fossilized algae. It kills silverfish by absorbing their waxy outer layer, causing dehydration. Lightly dust DE along baseboards, under appliances, behind toilets, and inside wall voids. Use a duster or a squeeze bottle to apply a thin, almost invisible layer. Do not apply where it can be stirred up into the air. Leave it down for several days, then vacuum and reapply as needed. It's safe for pets and humans but wear a mask during application to avoid inhalation.

💡 Tips:

• •Apply DE in areas protected from moisture; it loses effectiveness when wet.
• •Use a paintbrush to work DE into cracks and crevices.

⚠️ Warnings:

• •Wet DE is ineffective; reapply after cleaning or if it gets damp.
• •Avoid inhaling fine dust – wear a dust mask.

Step 6: Use Boric Acid for Heavy Infestations

Boric acid is a low-toxicity poison that disrupts silverfish digestive systems and exoskeletons. Mix equal parts boric acid and flour (or powdered sugar) to create an attractive bait. Place small amounts in crevices, behind furniture, or in shallow lids. Alternatively, use commercial boric acid powder. It works slowly, so expect results in 1-2 weeks. Keep away from children and pets. Do not use near food prep areas or where it can contaminate food.

💡 Tips:

• •Create a bait mixture: 2 tablespoons boric acid, 1 tablespoon flour, 1 tablespoon onion powder (optional attractant).
• •Place bait in jar lids or bottle caps in cabinets.

⚠️ Warnings:

• •Boric acid is toxic if ingested in large amounts; do not use in kitchens or near pet bowls.
• •Avoid inhaling the powder.

Step 7: Seal Entry Points and Cracks

Silverfish can enter through tiny cracks in foundations, walls, window frames, and around pipes. Use caulk to seal gaps in baseboards, crown molding, and around plumbing. Install weatherstripping on doors and windows. Fill holes around utility lines with expanding foam. This long-term measure prevents new silverfish from entering and reduces hideouts. Focus on rooms with moisture, like bathrooms and basements.

💡 Tips:

• •Use a flashlight to inspect the perimeter of rooms at night – silverfish often travel along pipes.
• •Seal gaps around heating pipes and vents where moisture may enter.

⚠️ Warnings:

• •Do not seal cracks that might hold electrical wiring without using fire-rated caulk.

Step 8: Use Natural Repellents Like Cedar or Essential Oils

Silverfish dislike strong scents like cedar, lavender, citrus, and clove. Place cedar shavings or blocks in closets, drawers, and bookshelves. Alternatively, mix 10-15 drops of essential oil (lavender, peppermint, or tea tree) with water in a spray bottle and mist areas where you've seen silverfish. Reapply weekly. This is a mild deterrent that works best when combined with other methods. It won't eliminate an infestation but can prevent new activity.

💡 Tips:

• •Cedar blocks can be placed in wardrobes to protect clothes.
• •Use a diffuser with essential oils in the bathroom or basement.

⚠️ Warnings:

• •Some essential oils can be toxic to pets – use caution around cats or dogs.

Step 9: Maintain a Clean, Dry Environment

After initial treatment, maintain a clean home to prevent recurrence. Vacuum weekly, especially in corners and under furniture. Check for moisture issues regularly. Keep basements and attics well-ventilated. Declutter storage areas and reduce paper accumulation. Monitor traps to catch new activity early. Consistency is key – silverfish can live months without food, but they can't survive in dry, clean conditions.

💡 Tips:

• •Set a monthly reminder to inspect and reapply DE or boric acid in problem areas.
• •Use a hygrometer to keep humidity in check.

⚠️ Warnings:

• •Don't skip maintenance even if you don't see silverfish – eggs can take months to hatch.

Step 10: Call a Professional If Needed

If your infestation persists after 2-3 weeks of rigorous DIY treatment, or if you see silverfish in multiple rooms despite low humidity and cleanliness, consider a professional pest control service. Professionals have access to stronger insecticides (like residual sprays with pyrethroids) and can treat wall voids and attics effectively. Also call if you suspect mold or structural moisture issues that need remediation. Get a quote and ask for a silverfish-specific treatment plan.

💡 Tips:

• •Look for exterminators experienced with silverfish, not just general pests.
• •Ask if they use low-toxicity options if you have children or pets.

⚠️ Warnings:

• •Avoid using foggers widely – they often don't reach silverfish hiding cracks and can be dangerous.

▸Pro Tips

• •Vacuum often, especially in areas where you store paper, as silverfish love old newspapers and cardboard.
• •Use a silicone-based caulk for sealing cracks; it remains flexible and lasts longer than acrylic.
• •Place bay leaves in corners and cabinets – some report silverfish dislike their smell.
• •To test for moisture problems, tape a piece of plastic over a concrete floor overnight; if condensation forms underneath, you have a moisture issue.
• •Freeze infested items like books or clothing in sealed bags at 0°F (-18°C) for 48 hours to kill all life stages.
• •Turn off outdoor lights near doors at night – silverfish are attracted to light but will also seek dark shelters.
• •Use a shop vacuum to clean deep crevices where DE or boric acid has built up; re-apply after.

▸Common Mistakes to Avoid

• •Only using one treatment method – silverfish require a combination of moisture control, cleanup, and insecticides.
• •Applying diatomaceous earth too thickly – a thin layer is more effective and less visible.
• •Ignoring the source of moisture, such as a slow plumbing leak, which will lead to reinfestation.
• •Using foggers or bug bombs – they push silverfish deeper into walls and can be harmful to breathe.
• •Forgetting to treat hidden areas like attics, crawl spaces, and behind appliances where they often breed.

▸Troubleshooting

Problem: I still see silverfish after using diatomaceous earth for a week.

Solution: Reapply DE in a thin layer after vacuuming; ensure it stays dry. Check for new entry points and increase dehumidifier use. DE works slowly, so give it 2-3 weeks.

Problem: Silverfish are only in my bathroom but I have low humidity overall.

Solution: Check for condensation on pipes, behind the toilet, or inside vanity cabinets. Use a moisture meter on walls; there may be a hidden leak. Improve ventilation with a stronger exhaust fan.

Problem: I have pets and children; are the products safe?

Solution: Food-grade diatomaceous earth is safe when kept dry and not inhaled in large quantities. Boric acid should be placed in unreachable areas. Use sticky traps in out-of-reach spots. Essential oils can be toxic to pets; use only cedar in solid form or sparingly.

Problem: Silverfish are back after a few months.

Solution: They likely survived in untreated areas like attic or crawl space. Re-treat those areas and consider professional help. Also check for cardboard boxes or stored paper that may have been reintroduced.

Harris Silverfish Traps (12-Pack) with Lure

Specifically formulated to attract and trap silverfish; easy to place in corners and monitor activity.

Best for: Place in bathrooms, kitchens, basements, and closets to catch and monitor silverfish.

Price Range: $8-$12

Diatomaceous Earth (Food Grade) by HARRIS

Highly rated, pure DE powder safe for pets and children when used as directed; effective for long-term control.

Best for: Apply along baseboards, under appliances, and in cracks to kill silverfish through dehydration.

Price Range: $10-$15

Bonide Boric Acid Insecticide Powder

Trusted brand, fine powder that can be used as a bait or dust in hidden areas; kills silverfish within days.

Best for: Mix with flour to create bait or dust directly into cracks and crevices where silverfish hide.

Price Range: $8-$12

Frigidaire 50-Pint Dehumidifier

Top-rated dehumidifier capable of maintaining optimal humidity levels; Energy Star rated and reliable.

Best for: Place in damp basements, crawl spaces, or large bathrooms to reduce moisture and discourage silverfish.

Price Range: $180-$250

GEAR AID Cracks & Crevices Silicone Caulk

Silicone caulk that stays flexible and seals gaps effectively; prevents silverfish entry points.

Best for: Seal cracks around baseboards, pipes, windows, and doors to block silverfish from entering.

Price Range: $5-$10