FOR IMMEDIATE RELEASE – April 28, 2009
Concrete block in buildings contributes to ‘balanced design’ that helps contain fires
BY PAUL HARGEST
When fire strikes, there can be any number of contributing factors, from human behaviour (an untended fry pan; a cigarette left burning) to the proximity of hazardous materials (half-empty paint tins stacked in a basement). Regardless of the cause, however, it’s the structural composition of the building that will largely determine how well the blaze is contained. And while industry-standard fire testing deems materials such as gypsum drywall to be fire resistant, the fact is that they cannot offer the fire protection of masonry products such as concrete block.
Following two fatal fires that made headlines this past January at retirement homes in Orillia, Ontario and Saguenay, Québec, the Canadian Concrete Masonry Producers Association (CCMPA) distributed an article questioning the rigor of our building codes and whether or not they were doing enough to protect citizens from the risk and consequences of fire.
A more recent incident at a residence at Waterloo, Ontario’s Wilfrid Laurier University, also with tragic consequences, has again drawn our attention to the question of building codes. However, a significant differentiating factor in the case of WLU, specifically Waterloo College Hall, is that the fire was relatively well-contained and quickly extinguished compared with the fires at the Muskoka Heights Residence in Orillia and the Appartements Belles Generations in Saguenay. Again, while there are varying and location-specific factors that would have contributed to these blazes (a lack of sprinklers has been cited in the Muskoka Heights fire, for example), it’s worth noting that in the construction of Waterloo College Hall, concrete block had been used not only in the separating walls between each two-bedroom unit but also in the shared bedroom walls within the units themselves.
According to Waterloo Fire Rescue, the block walls — in addition to the concrete slab flooring — was a critical factor in the containment of a fire that, while tragic, could have been even worse.
Waterloo College Hall is perhaps a good example of the ‘balanced design’ approach to fire safety in building construction. It’s an approach that relies on three complementary fire-safety systems:
- a detection system to warn occupants of a fire
- an automatic suppression system in high-hazard areas to control the fire until it can be extinguished
- a containment system to limit the extent of fire and smoke
Detection, most notably in the form of mandatory smoke alarms, has been the most well-publicized and arguably the most effective means of reducing injury and death due to fire. According to Canada Mortgage and Housing Corporation (CMHC), by 1999, the fire-death rate per 100,000 one- and two-family houses was 75 percent lower than it had been in 1980 — a drop attributed mainly to the legislated use of smoke alarms in new building construction.
Suppression is also being legislated in our building codes: in 2008, Ontario became the last jurisdiction in North America to mandate the use of sprinklers in new high-rise apartments and condos higher than three storeys.
Wouldn’t effective containment — or, as it’s referred to technically, compartmentation — be the next logical step in the fire-safety equation? By containing a fire, you minimize its damage and essentially buy more time until it can be extinguished. Fire ratings obtained through lab testing offer an indication of that time. Using industry-standard two-hour tests involving exposure to 1800°C temperatures, a wall made of concrete block easily withstands the heat and the subsequent blast from a fire hose at 30 PSI (pounds of water per square inch). When the same testing is applied to fiber-reinforced gypsum panels, the hose penetrates the panels in about 10 seconds. Not surprisingly, while the testing allows for two test samples of any one material in order to achieve a pass — and gypsum needs two — concrete block only ever needs to be tested once.
In a laboratory, we have the luxury of duplicating tests and debating the merits of one material over the other. Real life offers only one chance.
Which is why the concrete block industry will continue to fight for more rigorous and standardized testing. Concrete masonry can’t prevent fire, but it is the best way we have to contain it and increase not only our odds of survival but those of our firefighters as well.
Paul Hargest owns Kitchener-based Boehmer’s/Hargest Block Ltd. and is the President of the Canadian Concrete Masonry Producers Association (CCMPA). Paul is also Vice President of MasonryWorx (the marketing and government-relations body for the masonry industry); Chair, A165-04 Block Standard (CSA); Board Member, Canadian Masonry Contractors Association; Board Member, Ontario Masonry Contractors Association; and Executive Committee Board Member, National Concrete Masonry Association.
For more information or to arrange an interview with Paul Hargest, contact:
Marina de Souza
Managing Director, CCMPA
Toll Free: 1-888-495-7497