Cobra Rods & Plugs
Borate Rods for Wood Decay Prevention
Wood decay begins where moisture collects. Typically, it remains unnoticed. Log ends, exposed joints, and ground-contact areas are common trouble spots.
Borate rods provide targeted protection inside vulnerable wood without stripping away existing finishes. Cobra Rods release borate and copper complexes when inserted into damp wood.
The active ingredients move into the surrounding area to help eliminate decay fungi and prevent future rot. Many homeowners use borate rods for logs when specific sections need attention. Not a full-surface treatment.
Shop Available Sizes
Whether treating a single log end or several decay-prone locations, Cobra Rods provide a practical purchasing option without buying more product than the repair requires.
Product Information
Borate rods provide localized protection where surface treatments are not always practical. Cobra Rods function as a fungicide for wood while delivering dependable protection in moisture-prone areas.
For preventative treatment of wood, follow the Recommended Application Rates table. When treating exposed ends or joints, Cobra Rods should be installed within six inches of the exposed end or joint.
Features
- Great for ground-contact wood
- Targeted Protection
- EPA Approved
- Fungicide for wood exposed to recurring moisture.
Resource Links
How to Store
Keep borate rods in their original container until needed. Dry storage conditions help prevent unnecessary moisture exposure before installation. Handle each rod carefully to avoid damage before use.
How to Apply
Drill installation holes to the recommended depth before inserting each rod. Place them in decay-prone areas according to label directions. Seal every opening with the recommended plug before applying Energy Seal for a clean, finished appearance.
Maintenance
Inspect areas treated with borate rods during routine exterior maintenance. Log ends, joints, and other moisture-prone locations deserve extra attention. Replace damaged sealant when necessary. This will prevent moisture intrusion.
Newly exposed wood or repaired sections should receive additional protection according to current label recommendations. Consistent upkeep helps maintain long-term performance where decay is most likely to develop.
Recommended Application Rates
| Lumber Size (in) | Spacing (in) | Rods/Hole |
| 4×4 | 12 | 1 |
| 4 x 6 | 9 | 1 |
| 4 x 8 | 7 | 1 |
| 6 x 6 | 6 | 1 |
| 6 x 8 | 10 | 2 |
| 6 x 12 | 6 | 2 |
| 8 x 8 | 7 | 2 |
| 10 x 10 | 7 | 3 |
| 4″ D | 14 | 1 |
| 6″ D | 8 | 1 |
| 8″ D | 9 | 3 |
| 10″ D | 9 | 3 |
| 12″ D | 8 | 4 |
Installing Cobra Rods
Use a ½” drill bit to drill hole.
Drill hole at least 3 -¾” inches deep.
Clean out the hole and insert the Cobra Rod.
Insert the plastic plug into the hole.
Sealing Cobra Rods
Using a screw driver twist the plug clockwise.
Place the plug about ¼” below the surface of the wood.
Fill the hole with Energy Seal.
