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System Three Board Defense Borate Powder
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  • System Three Board Defense Borate Powder

System Three Board Defense Borate Powder

Board Defense is an EPA registered insecticide, termiticide and fungicide concentrate for the control of wood destroying insects and rot. This highly versatile conectrate protects and treats wood against all wood destroying organisms.

Board Defense is a water-soluble white powder. It can be used dry or in solution to form an effective penetrating solution. There are no hazardous solvents and no odors. The active ingredient in Board Defense, Disodium Octaborate Tetrahydrate, is a borate derivative that will not break down over time. Borates have been used as a safe and effective pest control for over 40 years.

Board Defense in an important part of the System Three EndRot System for wood rot repair and a favorite among wooden boat restorers.

IN STOCK - Available for pickup  
$8.35 / ea
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Tech Spec Product Info User Generated Content

Board Defense borate treatment effectively fights:

  • Decay
  • Fungi
  • Termites
  • Beetles
  • Carpenter Ants
  • Cockroaches
  • Ants
  • Silverfish
  • Crickets
  • Any other type of wood rot and fungi


BRAND: System Three
4.6 5

Really did the job


This purchase was for joists in an older porch that were showing some rot infestation. We applied two coats as directed using a common pesticide-type sprayer. The effect was excellent and the rot retardation visible. We still had to sister or replace where the rot was more severe but this product was a tremendous time and money saver. We're switching sides of the porch for phase two and will be ordering more.

Tommy in Idaho

Asotin, WA




great product and cheaper than buying from a contractor


Houston, TEXAS USA


Destroys and treats wood rot


I rebuilt my boat transom and needed a fungicide to control/treat the wood rot . After the removal of the infected wood , I received the Borate powder, I mixed the solution and treated the infected areas. I would like to know if the fungi was totally destroyed .




I mI may need more


Was the only product I found that could be shipped to a New York address for controlling powder post beetle in my 200+ year old house


South Lima, NY


This is an excellent product.


I had a seriously rotted 200-year-old beam that I applied it to. I followed mixing and application directions which were very clear. This was the first step in restoring the beam. It took two days to dry because of the location. I followed it with application of the epoxy. Next will be filling the beam and inserting reinforced iron bar. Your site provided me with the most complete information, both video and written. Comparing all the products that I found on the internet, I selected this because of price and informational support. Cutomer service was also very good.


Western Massachusetts


System Three Board Defense Borate Powder



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