Established
1967
Founded in Simcoe, Ontario, and still family-run. Half a century of shutdowns, rebuilds and new builds.
Est. 1967 · Simcoe, Ontario
The trades that keep industry running.
Mechanical, electrical, fabrication and training under one roof. From a single equipment install to a full plant turnaround, one accountable crew serving plants from Toronto and Niagara to London and the Lake Erie shore.
Exploded view / Boiler house, Unit 2
Every part of the job.
- 01 / 04 ESA / ECRA Industrial Electrical MCCs, cable tray, power distribution and PLC controls.
- 02 / 04 Millwrights Industrial Mechanical Pumps, dryers and rotating equipment, set and aligned.
- 03 / 04 TSSA Process Piping Steam, process and utility piping, fabricated and installed.
- 04 / 04 CWB Custom Fabrication Structural steel, platforms, stairs and handrail.
One crew. Every trade.
On the plant floor at
- Stelco
- Apotex
- Birla Carbon
- Toyota
- Teva
- Enbridge Gas
- Bosch Rexroth
- Vesuvius
- USG
- Carmeuse
- Jungbunzlauer
- Essex Furukawa
- Alco
Since 1967
For more than fifty years, Ontario's plants have called Rassaun when it matters the 2 a.m. breakdown, the eleven-day shutdown, the 140 tons of steel that have to fly before start-up. Welders, millwrights, pipefitters and electricians under one roof, with one number to call. Small enough to care. Big enough to get it done.
By the numbers.
A family-built contractor with the bench depth to take on a turnaround, and superintendents who pick up when a line goes down.
Skilled trades
100+
Tradespeople on the roster.
Breakdown call-ins
24/7
Our superintendents take client breakdown calls around the clock.
Project range
$5K to multi-million
Mid-size installs, rebuilds and shutdown scopes are our bread and butter. We'll take the small service call and the multi-million-dollar project too.
Industries served
12+
- Carbon Black
- Gypsum & Building Products
- Steel & Metals
- Pharma
- Chemicals & Gases
- Lime & Cement
- Pulp, Paper & Packaging
- Ethanol & Food
- Energy & Utilities
- Minerals & Aggregates
- Manufacturing
- Plastics & Recycling
- & more
Under one roof
One crew.
Licensed trades working side by side, so nothing gets lost between contractors.
MillwrightsElectriciansPipefitters & steamfittersWelders & fabricatorsAutomation technicians
- Millwrights
- Electricians
- Pipefitters & steamfitters
- Welders & fabricators
- Automation technicians
What we do
Four trades. One call.
From routine maintenance to multi-million-dollar capital projects, every discipline is in-house, so nothing gets lost between contractors.
01 01 / 04
Industrial Mechanical
Process piping, rotating and hot-process equipment, and material handling. Installs, shutdowns and plant maintenance.
- Shutdowns & down days
- Breakdown call-ins
- TSSA-registered piping
- Equipment installs & moves
02 02 / 04
Industrial Electrical
Power distribution, motor control and drives, control panels, and controls and instrumentation.
- ESA / ECRA registered
- Control panel builds
- MCCs & VFDs
- Hazardous locations
03 03 / 04
Custom Fabrication
Equipment built to your drawings, repairs and rebuilds, and piping spools in mild steel, stainless and aluminum.
- Built to print
- Strip, assess & rebuild
- CWB W47.1 / W47.2
- Piping spools
04 04 / 04
Training Services
Forklift, working at heights, MEWP, crane and confined space training, at your facility or ours.
- Forklift / telehandler
- Working at heights
- MEWP certification
- Overhead & carry deck crane
Selected work
Proof, at plant scale.
01 / 05
01 — Hamilton, Ontario
$4.7M+
Global Carbon Black Manufacturer
Unit 1 & 2 Bag Collector Retrofit
- The challenge
- Complex brownfield upgrade requiring demolition of existing stacks and installation of 140 tons of structural steel during a critical facility turnaround.
- What we did
- Turnkey fabrication and erection of structural support systems ($2.2M), installation of 304/316SS Process & Tail Gas piping, and heavy equipment setting.
- The outcome
- Massive emission control infrastructure delivered on-schedule, meeting strict TSSA piping requirements and shut-down deadlines.
- Structural Fabrication
- Heavy Rigging
- Shutdown Services
- Process Piping
- Equipment Installation
02 — Aylmer, Ontario
$3M+
Major Ethanol Producer
Whitefox ICE System Installation
- The challenge
- Full-scale integration of new dehydration technology within a Class 1 Zone 2 hazardous location, requiring seamless coordination across four distinct trades.
- What we did
- Executed deep foundation civil work, custom structural towers, 304SS process piping loops, and full electrical integration including new MCC buckets and heat tracing.
- The outcome
- Successful deployment of energy-efficient technology with complete TSSA & ESA certification and zero safety incidents in a hazardous zone.
- Civil & Concrete
- Industrial Electrical
- Mechanical Piping
- Hazardous Locations
- Project Management
03 — Ontario
$438K+
Global Wallboard Systems Leader
CertainTeed Dryer Zone 3 & 4 Rebuild
- The challenge
- Execute a complete demolition and rebuild of dryer top steel and insulated ductwork during a strict 11-day plant shutdown window.
- What we did
- Mobilized 24/7 double-shift crews (Day/Night) to remove existing plenums, install new open box delivery systems, and refit burner trains.
- The outcome
- Critical process heating zones restored and commissioned within the non-negotiable outage schedule.
- Shutdown Services
- Demolition
- Duct Fabrication
- Combustion Systems
- Millwrighting
04 — Wheatland County, Alberta
$663K+
Major Construction Materials Manufacturer
HRA Ball Mill Manufacturing
- The challenge
- Fabrication, assembly, and testing of a critical grinding mill system requiring precision alignment of heavy drive components and full-penetration CWB structural welding.
- What we did
- Completed turnkey manufacturing of shell, water jackets, and gear housings, followed by shop installation of motors/reducers and a full run-and-water test prior to cross-country shipping.
- The outcome
- Delivered a fully tested, production-ready heavy industrial asset to the client's Western Canadian facility.
- Custom Fabrication
- Heavy Machining
- Mechanical Assembly
- CWB Certified Welding
- Shop Testing
05 — Ontario
$418K+
National Building Products Manufacturer
Reclaim Conveyor Structural Reinforcement
- The challenge
- Structural rehabilitation of a critical reclaim conveyor system involving hazardous material handling (lead paint abatement) and complex access requirements.
- What we did
- Engineered a comprehensive scaffolding access plan to safely abate lead coatings, remove deteriorated decking, and install heavy reinforcing angles and galvanized grating.
- The outcome
- Extended the service life of critical material handling infrastructure while maintaining strict environmental compliance.
- Structural Rehabilitation
- Lead Abatement
- Rigging & Scaffolding
- Conveyor Maintenance
- Site Fabrication
project.Tell us what you need. Free, no-obligation quote.
Health & safety
Zero lost-time incidents in 2026. That's the culture.
Being a finalist for Canada's Safest Employers doesn't just happen. It takes every person on every crew, every shift, building a culture that keeps improving.
Finalist Canada's Safest Employers — Construction
- ISNetworld Active subscriber
- Avetta Active subscriber
- CWB W47.1 / W47.2
- TSSA Registered piping
- ESA / ECRA Registered
Industries
We work where Ontario makes things.
Twelve sectors, one standard. We learn your process, your people and your plant, so the next call goes faster than the last.
Don't see yours? We likely have experience in it.
- Carbon Black
- Gypsum & Building Products
- Steel & Metals
- Pharmaceuticals
- Chemicals & Industrial Gases
- Lime & Cement
- Pulp, Paper & Packaging
- Ethanol & Food Processing
- Energy & Utilities
- Minerals & Aggregates
- Manufacturing
- Plastics & Recycling
In their words
Don't take our word for it.
Plant managers, maintenance leads and operations teams across Southern Ontario.
Your people have become an intrinsic part of our environment, and their commitment to provide excellent service, as well as the quality of the workmanship is second to none.
I would like to take this opportunity to thank you and your wonderful people for your spotless performance and safety record during our annual turnaround. It is well known by us that in the last years our cooperation has continually grown, and we are looking forward to maintaining this trend in the years to come.
It pleases all of us here when a contractor not only performs well and gets the job done, but does it safely. Rassaun always acts in a responsible and professional manner. They care about the job they are doing for us.
At every stage of the project, Rassaun Services Inc., met their target dates and continually demonstrated pride in workmanship. This pride is passed from Rassaun's foreman to their employees because of their desire to provide the best possible service. They go the extra mile.
Rassaun went above and beyond to get us the resources we needed to not only get started on the gear tear down but also to shift resources and help with other major shutdown work. When we found we'd broken our 20 ton trunnion brass bushing on a Friday afternoon, once again Rassaun mobilized to have a spare built and ready to go 24 hours later.
We have had nothing but compliments from all who have seen the installation. Especially impressed, have been our companies' personnel from outside the plant. The quality of work was top notch and your efficiency was excellent.
Installs, rebuilds, shutdowns & breakdowns
Let's build what's next.
Whether it's a breakdown today, an upgrade next quarter or a major capital project, call us or send the details and a real person will get back to you.