Chimney & Stack Services

Inspection, Repair & Maintenance Programs for Chimneys & Stacks

Chimneys and stacks are vital components of power production and industrial facilities. Their unique operating conditions subject them to a number of different factors that can be detrimental to their integrity including exhaust fumes and gases, fuel ashes, condensation, rain, thermal variations, UV exposure, lightning, atmospheric CO², wind and ground stability. These factors can lead to deterioration of both external and internal components.


STRUCTURAL TECHNOLOGIES’ offers several levels of chimney and stack condition assessment services based on the specific needs of the owner and the project. The objective of a comprehensive condition assessment is to identify the root cause of problems and the level of damage.

Design Support & Specialty Products

Our chimney design experts support project teams by designing repair and maintenance programs for both external and internal chimney components. We offer a diverse range of specialty products and design support, including design and fabrication of permanent and temporary access systems and custom components. For major chimney retrofit programs, our team assists with design and material selection for modernization and life extension.

Turnkey Solutions

When STRUCTURAL TECHNOLOGIES teams with one of our repair and maintenance companies – we offer our turnkey Investigate-Design-Build (IDB) approach to provide a seamless process from initial design through installation with single-source responsibility. This approach is ideally suited for industrial and power clients looking to perform repair and maintenance during scheduled turnarounds and outages.

New Construction Services

Chimney Inspection Services

chimney inspection
Chimney Field Inspections

STRUCTURAL TECHNOLOGIES offers specialized chimney and stack assessment services to help plan and prioritize repair programs in a manner that maximizes plant safety and efficiency. We provide one-time or ongoing inspections of all chimney components, including:

  • Chimney Exterior
  • Liner(s) Interior
  • Liner Exterior / Annulus Space
inspection reporting
Inspection Reporting

When STRUCTURAL TECHNOLOGIES performs a comprehensive chimney assessment, our typical report includes:

  • Inspection summary
  • Inspection findings with photos and narrative
  • Recommendations for non-outage and outage required repair and maintenance

By incorporating the capabilities of our specialty solutions provider companies, our final report and client briefing can also provide repair and protection alternatives and their associated order of magnitude repair investments.

chimney inspection uav
Enhanced Inspection Services

STRUCTURAL TECHNOLOGIES now offers enhanced chimney inspections – a safe, rapid approach that provides full coverage visual inspections. Utilizing advanced cameras mounted to unmanned aerial vehicles or tethered, our team can provide rapid, total assessment of chimneys and stacks.

The data acquired allows our chimney experts to analyze the entire chimney structure and provide a full report, and to monitor specific conditions and identified issues on future inspections. Additionally, our team builds a digital model of the chimney which may be used to precisely identify locations and tests to perform additional if a more thorough, manned investigation is required.

Design & Engineering Services for Existing Chimneys

Our team designs and implements efficient solutions to fix identified problems, improve safety or extend the service life of chimney and stack components, including:

borosilicate block liner
Liner Upgrades & Replacement

Many chimneys, ducts and flue gas path systems were not designed to meet today’s operating conditions or stringent safety requirements. Upgrades or alterations to the liner systems can help meet these changing demands. Our team partners with owners, builders and designers of unit and plant modifications to work through all project details, including:

  • Liner system selection – our vast experience with all liner system types including brick, gunite, steel, alloy steel and fiber reinforced polymer (FRP) systems helps owners choose the best system for their unique needs.
  • Planning and design – our design and construction teams integrate to develop detailed means and methods for quality control of the liner system as well as designing and fabricating engineered access and work platforms.
chimney ductwork replace
Ductwork Alterations & Replacement

As new units are added to existing facilities, STRUCTURAL TECHNOLOGIES provides comprehensive design-build delivery of new ductwork systems.

Our team address the complexities of working in operational facilities and incorporate all project aspects into our designs, including:

  • Ductwork design and fabrication
  • Chimney modifications and tie-ins
  • Construction planning
ductwork supports
Support Infrastructure

STRUCTURAL TECHNOLOGIES designs, builds, repairs and maintains a wide variety of civil infrastructure for flue gas path systems, including:

  • Ductwork support structures
  • Rotating equipment foundations
  • Pedestals and structural supports
  • Tanks and vessels
  • Silos
chimney maintenance
Maintenance Planning

Our team designs efficient solutions to fix identified problems, improve safety or extend the service life of chimney and stack components, including:

  • Brick, Alloy, Steel, & FRP Liners
  • Platforms and Ladders
  • Rain Hood
  • Lightning Protection
  • Aviation Warning Lights / Paint
  • Exterior Repairs
  • Coatings
  • Foundations
  • Expansion Joints
  • Ductwork
chimney capping

Chimneys and stacks that are no longer in service require ongoing maintenance programs to ensure they don’t become a hazard to safety and plant operations. In addition to regular inspections and repairs, our team offers long-term planning and modifications to chimneys and stacks removed from service, including:

  • Exterior repairs and coatings
  • Design, fabrication and installation of chimney capping systems
  • Liner removal
  • Ductwork capping
  • Removal of components
chimney demolition

For chimneys nearing the end of their service life, our team custom engineers plans for a variety of specialized controlled methods – providing safe and efficient demolition, even in operational facilities. STRUCTURAL TECHNOLOGIES assists project teams with:

  • Method selection
  • Specialized demolition technologies
  • Customized access / platform design

Specialized Products for Chimneys & Stacks

We offer a diverse range of specialty products and design support, including corrosion and moisture control technologies – to help design repair programs to extend the service life of chimneys and stacks.

Tstrata Concrete Repair™ Products

Tstrata Concrete Repair™ Products
Specialized concrete repair materials and custom ready-mix designs for maximizing durability of repairs.

Corrosion Control

Corrosion Control
Systems for controlling corrosion in reinforced concrete and steel infrastructure.

Moisture Control & Waterproofing

Moisture Control & Waterproofing
Products and engineered solutions designed to solve challenges with moisture and leaks in concrete structures.

Structural Strengthening

Structural Strengthening
Advanced systems used to restore or increase the load-carrying capacity of reinforced concrete, masonry, timber and steel.

Repair & Maintenance Services

chimney liner demolition

When teamed with one of our repair and maintenance companies – STRUCTURAL TECHNOLOGIES provides owners and operators a turnkey investigate-design-build approach from a single source of accountability.

Our contracting companies have established stringent technical guidelines, tried and tested repair details, and quality standards for field procedures for repair and maintenance of chimneys and stacks. Our contracting partners provide specialized field leaders and crews – staffed with experienced technicians – to work closely with project teams from project pre-planning through completion.