Boric Acid for Roaches

5 Best Boric Acid For Roaches

Boric Acid for roaches is a common solution to get rid of the pest.

Not only are roaches undesirable, they also carry with them germs and diseases that are harmful to us.

If it is the occasional visits from members of the roach family, you could turn a blind eye but usually, the appearance of one or two roaches should ring warning bells in your head. Roaches do not come in just one or two but an entire population.

To get rid of them, you have to go to the root of the problem and here are some ways cheap and efficient ways to exterminate these pesky visitors.

After putting all the common roach killers to the test, the single ingredient that makes one insecticide efficient is the lifesaving – Boric Acid.

Boric acid for roaches usually comes in powder form which will then be mixed to become either Boric Acid Paste or Boric Acid Gel. Mixtures are usually done with something sweet to produce a boric acid bait (more details on that later).

What is Boric Acid and How does it Kill Roaches?

So, what exactly is Boric Acid?

Boric Acid is an au-natural product derived from Boron and is actually an antifungal cure-all of sorts, according to Dr. Josh Axe, from (

As dangerous as it sounds, Boric Acid is actually found in fruits and plants that are harmless to humans and pets when used appropriately. It’s also the key ingredient in a variety of effective and affordable home remedies like fungal infection, Yeast Infections, Eyewash, Acne, Athlete’s Foot, Household Cleaner and of course, roach killer.

How Exactly Do Boric Acid Kills Roaches?

When cockroaches come into contact with boric acid, the powder sticks to the roach and ingested by the roaches when they clean itself. The ingested boric acid cause destruction to the exoskeleton of the roaches and dehydrates their body.

It takes about 72 hours for the boric acid to take effect and lead the death in the cockroaches. Younger, less developed cockroaches take lesser time and will die in 24 to 48 hours.

Upon exposure, the roaches will behave differently such as foraging in the day where sunlight is present. Instead of sticking close to the walls for protection and comfort, they will scamper in the middle of the room.


Boric Acid Roach & Ant Killer Check Price
2Boric Acid Granular Powder Check Price
3Harris Boric Acid Roach Powder Check Price
4CB Borid Boric Acid Dust Check Price
5Duda Energy borp1 Fine Powder Boric Acid H3BO3 Check Price

2 Common Mistakes: When Using the Boric Acid for Roaches

To get the most bangs for your buck, here are some common mistakes to avoid:

Mistake #1: Applying too much

Use boric acid sparingly. Applying too much may risk getting detached by the cockroaches and causing the powder to be avoided altogether.

A thin layer should be sufficient and what we are aiming for.

If you are buying the boric acid from, add a bulb duster into your cart, which will aid in easier application. Professionals swear by it to get the perfect amount that is almost not seen by the naked eye.

If you are using a squeeze bottle, ensure that the opening is small (cover the opening if it’s too big). Remember to shake the bottle thoroughly before every application.

Mistake #2: Targeting the wrong area

Adopt a targeted approach by hunting down the breeding grounds of the cockroaches. Where you apply the boric acid for roaches is consequential to the results you get and it is helpful to know what kind of roaches you are dealing with as different roaches have different habits.

Common suspects include dark and damp areas like under the washbasins and narrow, tight spaces like in between cabinets and underneath refrigerators. Watch out for cracks and openings in walls.

Application in these areas will help in your mission to get rid of the roaches. There is no hard and fast rule as to where they appear most frequently so you might want to spend some time observing before getting hands on.

To gauge where they manifest, switch off the lights of the affected area at night. Give it a few hours before returning to the room and turning on the lights, you will be able to see where the roaches are congregated and zoom in straight to these areas to effectively get rid of them.

Adding on to this point …

Where to Apply Boric Acid?

Food & Water Source

Cockroaches are always not far-off from their source of food.

A good estimate would be five feet from food and water. In instances where you have seen a few scattering around, their nest is probably nearby. Cockroaches hint to their comrades on food locations.

Seeing roaches in the day should alert you to the seriousness of the problem and action should be taken.

Cracks & Crevices

Start from cracks and crevices in areas where cupboards are joined to the wall. Ideally, sealing the holes in the wall with silicon or caulk will be useful. Pipes in the wall are potential hiding places so closing the gap with expandable canned foam is a possibility. The refrigerator, behind and underneath, is a danger zone.

Sprinkle some boric acid in places such as dishwashers and trash compactors and make sure no stone is unturned.

Although cockroaches are attracted to places with food, the bathroom is also another roach hot spot.

Boric acid should be applied to the cracks and crevices there. Water sustains the roaches, so ensure that the pipes are not leaking and insulated, such that condensation does not provide water for them. Clogged drainage areas are also a potential breeding ground, so make sure hairs are washed down the sinks and drainage pipe.

[May: Some readers had experiences where cockroaches are attracted to their toothpaste (somehow it’s also a source of food to them), hence be sure to cap your toothpaste after use!]

1) Boric Acid Roach & Ant Killer NET WT. 1 LB. (454 gms) – 2 pack

Brand: Zap-A-Roach

Zap-A-Roach is colorless and odorless powder insecticide obtained from borates that are a natural ingredient in soil, rocks, and seawater. A multi-purpose insecticide that is not just effective towards roaches, it kills ants, spiders, beetles and fleas as well.

This product can fix wood rot, albeit slowly.

It is estimated for three to ten days to pass before the effectiveness is seen.

  • Kills roaches, water bugs, fleas, ants and silverfish
  • 100% Boric Acid- odorless, non-staining
  • Double value with 2 per pack
  • Packaged in heavy-duty resealable Ziploc type bag for convenience
  • Requires frequent reapplication

2) Boric Acid Granular Powder 5 Lb. Create your own solution

Brand: Florida Laboratories

Very similar to the boric acid by Zap-A-Roach, this product by Florida Laboratories is 100% Boric Acid and comes in resealable packaging.

  • Packaged in resealable foil type Ziploc bag
  • Flame Retardant (reduced impact of fires on people, property, and the environment)
  • Suitable for multiple-use
  • Works well on ants
  • Duster sold separately

Note: Loose fitting clothing and gloves are recommended when using this product. Goggles are also advised as with a protective mask if the area is dusty. Ensure that there are proper ventilation and store product in a cool and dry place.

3) Harris Boric Acid Roach Powder With Lure, 16 oz

Brand: Harris

The Harris Boric acid Roach Powder has been around the pest control department for decades.

Harris is not only effective against roaches, but also deals with other bugs such as the Palmetto, water bug and silverfish. It contains 99% boric acid and comes with a complementary lure – a straw applicator that helps application in hard-to-reach areas like crevices and cracks.

Even though the product stays on the treatment ground for a period of time, it is also safe to use around pets.

  • Also work on other pests (like Ants, Waterbugs, Silverfish and More)
  • Puff into Difficult to Reach Areas (i.e. Under Refrigerators)
  • Long-Lasting Formula
  • Not suited for use outdoor
  • Might take some time to kill the roaches

Tip: If you don’t wish to invest in the extension, simply cut spray cap to size you want and the powder will puffs out nicely.

4) CB Borid Boric Acid Dust

Brand: Borid

CB borid boric acid dust is a nonflammable, stainless and odorless powder that works on roaches, termites, and other insects.

  • Long lasting and odorless
  • Convenient packaging
  • Works on other pests like Palmetto bugs, Waterbugs, Ants (excluding Carpenter Ants), Silverfish, and Darkling Beetles
  • Nozzle does not always dispense product evenly
  • Might result in burn out grass

Tip: Most cabinets have a small gap on the top of the kick plate that allows you to apply the product directly. If it’s all sealed up, drill a small hole for access.

5) Duda Energy borp1 Fine Powder Boric Acid H3BO3 99, 1 lb

Brand: Duda Energy

The H3BO3 Granular is an industrial Grade boric acid with 99.9% purity. Granular boric acid is denser, much like salt crystals, and is very fine.

Mix the granular or powder boric acid with sugar, roughly at a 5% or less boric acid concentration (use higher concentration in the case of Ants). Next, add small amounts of water to make it into the texture of a paste. Apply the paste to areas of where roaches are found.

  • Industrial Grade Strength
  • Mixes easily (fine powder)
  • Can double as a product to clean the toilet bowl
  • Value for money
  • Can be quite hard to open (Difficult knotted closure)
  • Not stored in resealable bags
  • Duster sold separately

Tip: Keep product away from plants


6) Make-your-own Boric Acid

We’ve also found a video that teaches you how to make your own Boric Acid:

We do not recommend going that route as it’s too much effort and can create quite a mess in your house. Boric Acid is really not expensive to buy off the shelf and one pack can last really long with proper storage.

General Rules
  • Go easy on application – thick layers are not advisable. Not only do you not get your desired outcome, you waste the boric acid.
  • Applying boric acid roach powder can be a messy affair, application and reapplication should be away from children, pets, and food areas.
  • Exercise care when using the product in food-handling establishments. Avoid exposing product into the air to reduce transmission. Although the product can be used, limit the application to a small amount to cracks and crevices in these places.In non-food areas,
  • In non-food areas, application can be more generous but do not overdo it until the effect is lost. For pre-construction application for prevention, baseplates and plumbing voids are your target area.
  • Keep the powder in a dry place away from sunlight to ensure its longevity.

Pro-tip 1: To quicken the effectiveness of the product and increase your chance of exterminating the entire nest, mix the powder with sweetened condensed milk until a sticky paste is formed; this will act as the lure for the roaches.

Once the cockroach brings the contaminated food back to the nest, all the roaches will feed on it. On occasions where roaches die, other roaches might eat them up and the poison gets passed on.

[May: Our go-to bait is peanut butter. Give it a try if condensed milk is not readily available at home.]

Pro-tip 2: Avoid glue traps as a combination with boric acid. This works in a multiplier effect, a roach killed by boric acid can go on to kill the entire nest but if it is trapped, the cockroach dies alone and the effect does not spread.

Pro-tip 3: Roach baits work hand in hand with boric acid. Gel baits lure the cockroaches to them, something that boric acid alone does not do. Certain gel baits, in fact, use boric acid to kill the roaches. Gel baits can cover unreachable places by boric acid like around trash.

In Conclusion

In general, using boric acid for roaches takes effect in one to five days’ time but depending on the severity of the situation, exterminators should be considered as an option for a quick and fast extermination.

However, despite glowing reviews on the success rates from using boric acid for roaches, it helps to widen your options to include other products that may supplement the effectiveness. Remember that this might be a trial and error process to obtain the best combination.

To go a little extreme, force the roaches into your treatment area. Electronic pest repellents are your magic wands to bring the roaches towards the boric acid.

Be consistent in your application and in a month’s time, the pests should clear up.

NOTE: Any product that will kill a roach is usually somewhat dangerous to humans. Therefore, be mindful of pets and babies when using treatment.

>> Check out this post for our list of organic & Natural roach products

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