Concrete block in buildings contributes to 'balanced design' that helps contain fires



    By Paul Hargest

    TORONTO, April 28 /CNW/ - 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 degrees celsius 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 further information:

For further information: or to arrange an interview with Paul Hargest,
contact: Marina de Souza, Managing Director, CCMPA, Toll Free: 1-888-495-7497,
Phone: (416) 495-7497, Fax: (416) 495-8939, mdesouza@ccmpa.ca, www.ccmpa.ca


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