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How to Use a ShopVac to Blow Borax or Boric Acid Into Crawlspaces to Kill Roaches

Jessica Jewell

Cockroaches are flat-bodied, oval insects in the Blattidae family. Many species of cockroaches, commonly called roaches, palmetto bugs and water bugs, are common household pests. Not only are roaches a pain to deal with, they can damage your property and spread germs and diseases. With the correct operation of a ShopVac machine, you can blow a mixture of boric acid and sugar into your crawlspaces to kill the roaches.

Roaches can damage household items and contaminate your food.
  1. Mix equal parts boric acid with sugar or flour. Stir the two together in a bowl.

  2. Turn your ShopVac to the leaf-blowing setting. Not all ShopVacs can be used for this project because not all ShopVacs come equipped with the blowing feature. Make sure that you have or rent the correct ShopVac before trying to perform this procedure.

  3. Put on a cleaning mask and protective eyewear.

  4. Pour out a small amount of the boric acid mixture on the floor just inside the entrance of the crawlspace.

  5. Turn on the ShopVac and blow the boric acid mixture into the crawlspace. The blow feature on a ShopVac is extremely strong, so you will only need to turn the machine on briefly so that the mixture is blown into the space.