Excerpt from the government of Ontario’s ‘Newsroom’
Two workers died and four others were critically injured when a section of a building under construction collapsed. iSpan Systems LP (iSpan) failed to ensure that a building, structure or any part thereof, was capable of supporting any loads that may be applied to it. East Elgin Concrete Forming Ltd. (East Elgin) failed to provide proper information, instruction and supervision, specifically on the use of proper concrete measuring techniques on the project. Both offences are contrary to the Occupational Health and Safety Act.
The companies involved were,
iSpan Systems LP, of Princeton, Ontario, a manufacturer of steel joist systems for building construction, and
East Elgin Concrete Forming Ltd., 10 Elm Street, Tillsonburg, Ontario, N4G 0A7, a concrete contractor specializing in foundation and flat work.
On December 11, 2020, a section of a building under construction collapsed to the ground during a fourth-floor roof level concrete pour, resulting in fatal injuries to two workers and critical injuries to four other workers.
iSpan Systems LP fabricated the building’s structural steel frame, including the frames necessary to support the concrete forms. East Elgin Concrete Forming Ltd. was responsible for the concrete pour, retaining supervisory duties while subcontracting the roof pour to another company.
A Ministry of Labour, Immigration, Training and Skills Development (MLITSD) investigation identified deficiencies in iSpan’s fabrication and methodological errors in East Elgin’s procedures that contributed to the collapse.
East Elgin employed a laser level and directed the subcontractor to pour to the height of the laser level. The laser level on its own failed to account for the deflection of the steel frame that occurred from the weight of the concrete. The use of a dipstick would have remedied this problem by providing a true reading of concrete depth during the deflection process.
As a result, workers were left with the incorrect assumption that the concrete depth was insufficient at certain locations in the pour. Consequently, more concrete was applied than had been specified by iSpan.
An engineering analysis carried out by MLITSD engineers determined that the concrete placed exceeded the design values by considerable amounts. The weight of the applied concrete contributed to the collapse and/or its severity.
Good engineering practice requires not only that a building possess sufficient capacity to support anticipated loads, but also that it possesses a margin of safety for unexpected loads.
The MLITSD engineering analysis determined that another contributing cause of the collapse was the failure of a roof beam support, referred to as a beam pocket. The loads transferred to this beam pocket from the stud packs exceeded its ultimate load carrying capacity resulting in the failure.
The analysis revealed that while iSpan’s approved engineering drawings specified a 14-gauge deep track for the stud pack, an iSpan employee changed the deep track to a thinner and shorter 16-gauge shallow track. Additionally, the welds between the studs were placed lower than had been specified by the fabrication drawings which may again have reduced its capacity.
iSpan’s quality control department failed to detect these errors. If the wall had been fabricated as designed, it would have possessed a sufficient margin of safety to account for the overpouring of concrete and the collapse could have been avoided.
My opinion
The law(s) in contravention:
iSpan was found guilty of a contravention of the Ontario Occupational Health and Safety Act (OHSA), section 25, subsection 1(e)(iii) which states,
“An employer shall ensure that,
(e) a building, structure, or any part thereof, or any other part of a workplace, whether temporary or permanent, is capable of supporting any loads that may be applied to it,
(iii) in accordance with good engineering practice.”
East Elgin was found guilty of a contravention of the OHSA, section 2t5, subsection 2(a) which states,
“An employer shall,
- provide information, instruction and supervision to a worker to protect the health or safety of the worker.”
All the mistakes made and many died because of it.
I have a great respect for engineering BUT, the information laid out in the blueprints MUST be adhered to.
Our thoughts go to the families of those that passed away or were injured. This accident should never have happened.
Mind you, there have been a few wall collapses, in the construction sector the past few years.
HRS Group Inc. has a great team that can help you with all your health and safety needs including ‘Due Diligence’.
Contact Deborah toll free at 1-877-907-7744 or locally at 705-749-1259.
We can also be reached at
Ensure your workplace is a safe place.
Remember – In Ontario, “ALL Accidents are Preventable”
‘Work’ and ‘Play’ safe.
Daniel L. Beal
CHSEP – Advanced Level
CEO & Senior Trainer
HRS Group Inc.
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