Wood Pole Restoration 

If a pole's strength falls below code requirements due to decay or damage, the pole is considered a “reject” and must be restored or replaced.

In the United States, the National Electrical Safety Code (NESC) or California’s General Order 95 (GO95) establish minimum criteria that allows for some strength loss in wood poles before a pole must be restored or replaced.  Utilities generally follow those minimum criteria by restoring or replacing a pole that is evaluated to have less than 67% of its original bending strength. 

As a world leader in wood pole inspection and restoration, Osmose technicians are experts at evaluating a pole’s remaining strength and suitability for restoration.  This includes using preservatives to control decay and protect the remaining serviceable wood to ensure the longevity of the newly-restored pole and the overall integrity of your plant.

Osmose pole restoration systems provide reliable, long-term solutions for extending service life.  Osmose restoration systems:

  • Restore poles to code-mandated strength
  • Add decades of service life
  • Save you money – pole restoration is often one-third or less than the cost of replacement
  • Improve structural resiliency of the grid
  • Help you avoid the hassle of replacement, which includes change-outs, transfers, double wood, and service interruptions


Osmose Truss Systems

Osmose trussing systems are engineered for safety and reliability, and have been thoroughly tested and proven throughout their 50-year history.  No other pole restoration system has a comparable history of success in actual field applications.

  • Constructed to exceed NESC strength requirements; formed from 80,000 psi yield strength steel (C-Truss®) and 100,000 psi yield strength steel (C2-Truss)
  • Hot-dip galvanized to ASTM A-123 standards to ensure long-term corrosion protection
  • Banding is the strongest in the industry at 138,000 psi tensile strength (minimum)
  • Maintains positive contact with the pole butt below ground to properly transfer bending loads
  • Wood poles are remedially treated to effectively control decay and ensure the longevity of the restoration

How Trusses Work

When bending loads are applied to a reinforced pole, they are transferred to the truss.  The truss allows the bending loads to effectively bypass the decayed or damaged groundline area of the pole, transferring the loads to sound wood foundation below ground.

Diagram describing how trusses work with wind loads creating bending.

Trussing Options

The patented C2-Truss™ systems restore common distribution size poles with an optimized design that provides a more efficient, lighter weight, lower cost truss.  The Osmo-C-Truss® systems typically restore transmission and larger distribution-size poles.

Truss solutions can be adapted based on pole conditions.  For more advanced decay (thinner shell applications), double trusses can be utilized.  For decay that has progressed beyond standard installation heights, a taller truss is the best solution.

Image showing the four different trussing options


An Alternative to Trussing: FiberWrapTM II

Osmose FiberWrap is an omnidirectional and fully scalable composite repair system ideal for:

  • Poles with limited access
  • Poles in areas where the restoration needs to match the appearance of a new wood pole
  • Poles with high decay or decay at varying heights

FiberWrap II


Osmose Turnkey Pole Restoration Services

As wood pole inspectors, pole reinforcement product designers, and installers, Osmose provides true turnkey wood pole management services to clients across the U.S.  In fact, our skilled and trained technicians evaluate millions of poles each year, while ensuring restoration solutions are properly specified and installed so that you receive substantial, long-term value from your pole plant investments.

System Hardening

Osmose wood pole restoration also acts as a system hardening solution by improving an overhead circuit’s resistance to extreme weather events. Without the restored strength the truss provides to the weakened pole, the overall circuit is at greater risk of an outage during a significant weather event. 

A utility’s grid resilience is positively affected with a robust life extension program which includes treatment and restoration. Preservative treatments arrest active decay and maintain the strength of serviceable poles and weakened poles are restored. These activities help to minimize the number of poles needing attention after a significant weather event as utility crews work to restore power to the grid.

To learn more, call your local Osmose professional.  Not sure who your local professional is?  Email poleinfo@osmose.com to find out.