Grenfell: the perfect formula for tragedy
Within 51 days, the world witnessed three unfortunate events in cities separated by thousands of miles around the globe: London, Honolulu, and Dubai. All three events can be described simply as preventable losses due to the lack of automatic fire sprinklers and/or the use of highly combustible exterior construction.
These fires received ample local and international news coverage, while one combination of fire protection – sprinklered plus non-highly combustible construction – never captures headlines. Numerous editorial, op-ed and technical declarations followed these massive losses, each citing the chain of events, cause of origin and lack of proper regulations. The Marco Polo Apartment fire (Honolulu) showed what can happen when no sprinklers are present in a building made of noncombustible exterior construction. The Torch Tower fire(s) (Dubai) exemplified the fire potential from highly combustible exterior construction used in conjunction with interior automatic fire sprinklers. Finally, the tragic Grenfell Tower fire (London) illustrated the impact of lack of automatic fire sprinklers and highly combustible exterior construction.
Highly Combustible Exterior, No Automatic Fire Sprinklers
The 24-story Grenfell Tower, located in West London, experienced a tragic fire on June 14, 2017, in which at least 80 people died. The 1974 concrete building was renovated in 2016 and retrofitted with aluminum composite panel rainscreen cladding to improve energy efficiency and visual appearance. However, the renovation did not include the addition of sprinklers1. The cause of the fire is reported to be a refrigerator in a fourth-floor unit2. There were no automatic fire sprinklers to control the internal fire. The fire spread and reached external openings. Once ignited, the highly combustible new building cladding allowed the fire to spread rapidly up and along, and ultimately through, the entire building.
Highly Combustible Exterior, Automatic Fire Sprinklers
On August 3, 2017, the 86-story Torch Tower in Dubai experienced its second fire in 2 1/2 years. The fire originated on the 26th floor and spread to the top of the building. It is reported that 38 units and 64 exterior floors of the tower were damaged3. The cause of the fire is reported as the result of cigarette butts discarded into a potted plant4. Similarly, on February 21, 2015, fire originated on the balcony of a unit on the 51st floor of the tower and spread rapidly along the exterior. Torch Tower, like most high-rise buildings in Dubai5, 6, was sprinklered. Thus, fire was limited to the exterior of the building. No casualties were reported in either fire event at the Tower; and, according to reports, interior damage was minimal, with most residents returning within days7.
Marco Polo Apartments
Noncombustible Exterior, No Automatic Fire Sprinklers
Marco Polo apartments, in Honolulu, is a 36-story, unsprinklered, reinforced-concrete building built in 1971. On July 14, 2017, a fire began on the 26th floor, again due to the lack of automatic fire sprinklers, the fire propagated from the room of origin, spreading internally and to the exterior of the building8. The noncombustible concrete exterior construction limited the external fire propagation to the 28th floor. There was no significant fire spread along the building exterior as occurred in the Grenfell and Torch Tower fires. In all three, it is reported that the exterior fire spread occurred within minutes2, while with the noncombustible concrete construction, the exterior fire – after two hours – was limited to two floors of the 36-story Marco Polo building.
As modern construction practices drive buildings to new heights, no matter how efficient or resourceful the local fire service is, the different combinations of construction aspects always set the stage for fire service response and must be factored into building designs.
Comparison of Scenarios
When unfortunate events like these occur, the fire service plays a critical role. Response times vary globally. In Dubai, the average response time for 30 percent of fire incidents is four minutes9, while in the U.K. the 2014 – 2015 average response time to nonresidential building fires was eight minutes and 28 second10. As modern construction practices drive buildings to new heights, no matter how efficient or resourceful the local fire service is, the different combinations of construction aspects always set the stage for fire service response and must be factored into building designs. In Honolulu, the lack of automatic fire sprinklers allowed the fire to spread beyond the room of origin. Fortunately, the noncombustible exterior construction limited fire propagation, but not enough. The fire did result in three deaths and numerous injuries. Honolulu Fire Chief Manuel Neves is quoted as saying, “Without a doubt, if there was (sic) sprinklers in this apartment, the fire would be contained to the unit of origin”11. The mayor of Honolulu, Kirk Caldwell, added that “[a] sprinkler system could have contained the fire” and that this event was a “good example of what it means when you don’t have fire sprinklers”12. The two Torch Tower fires in Dubai demonstrated that the use of highly combustible exterior materials leads to rapid fire spread and propagation along the building; however, the use of automatic fire sprinklers prevented the fires from propagating internally, minimizing damage within the units and preventing fatalities.
It needs to be noted that automatic fire sprinkler water supplies are not designed for multiple-ignition locations. With a highly combustible exterior, the fire will propagate unabated along the full exterior of a building and can result in multiple interior fires that can overtax the sprinkler system. This was evident in an earlier fire at The Address Downtown Dubai, which occurred on New Year’s Eve, 2015 on the terrace of the 20th floor. The building was sprinklered and the sprinklers operated; however, due to the rapid exterior fire spread, “the extent of the blaze was beyond the capacity of regular sprinkler systems to cope with a major fire across more than 40 floors. The pressure on the fire safety systems meant that the building had exhausted its water supply within 15 minutes.”13 In this case, the fire load exceeded the sprinkler system design; hence, it did not provide complete property protection. The sprinkler system did, however, function as a life safety device by extending the time occupants had to safely evacuate the building. The result was an event with no fatalities attributed to the fire.* Further support that automatic fire sprinklers are critical to the life safety of building occupants comes from the BBC, which reported that “a spokesman for the Chief Fire Officers Association said that nobody had ever died in a fire in the U.K. in a property with a ‘properly installed sprinkler system working the way it’s meant to.’”14
The Grenfell Tower scenario was the most dangerous combination of factors, resulting in a total catastrophic loss. There were no automatic fire sprinklers; the fire that originated within the building was not controlled and therefore propagated both internally and externally. The highly combustible exterior resulted in rapid fire spread along the entire building. Had automatic sprinklers been installed, the fire would have likely been controlled to the room of origin, and the world would never have heard of Grenfell Tower.
This formula for tragedy has existed for years and there are numerous events that have proven it time and again.
Highly Combustible Construction + Lack of Automatic Fire Sprinklers = Tragic Catastrophic Loss
Following each of these events, local governments were forced to react with investigations and evaluations of local building codes, standards, regulations and enforcement.18, 19, 20 FM Global’s International Codes and Standards team is fully aware of this formula for loss. The team is working in regions around the world to proactively establish sound requirements prohibiting the use of materials that have not illustrated adequate performance under ‘end use’ conditions21, 22, and mandating the use of automatic fire sprinklers. These efforts will enhance regulations to prevent these tragic events from occurring23.
Whether you are in the Middle East, on a tropical island or in a metropolitan area anywhere in the world, the formula for tragedy is as simple as 1 + 1 = 2: Highly Combustible Construction + Lack of Automatic Fire Sprinklers = Tragic Catastrophic Loss.
For more information, go to www.fmglobal.co.uk
1 https://www.thesun.co.uk/news/3804113/grenfell-london-towerfire- cladding-fire-tests-latest-updates/, accessed on August 25, 2017
2 http://www.independent.co.uk/news/uk/grenfell-tower-blockdesign- caused-fire-unusual-investigation-reports-combustible-claddingunsafe-a7806951.html, accessed on August 22, 2017
3 http://gulfnews.com/news/uae/emergencies/video-torch-tower-fireat- dubai-marina-put-out-38-flats-damaged-1.2068756
4 http://gulfnews.com/news/uae/emergencies/dubai-police-revealcause- of-torch-tower-fire-1.2082198, accessed on September 12, 2017
5 https://www.thenational.ae/uae/external-sprinklers-part-of-newfire- safety-rules-for-dubai-towers-1.561919, accessed on August 22, 2017
6 http://www.arabianbusiness.com/uae-experts-warn-over-claddingafter- london-tower-blaze-677848.html, accessed on August 22, 2017
8 http://www.erienewsnow.com/story/35907989/ hawaiibuildingexpertcom-warning-after-worst-high-risebuilding-fire-in-hawaii, accessed on August 16, 2017
9 http://gulfnews.com/news/uae/emergencies/dubai-civil-defenceresponds-to-30-of-fires-in-4-minutes-1.1882858, accessed on August 30, 2017.
10 https://www.fbu.org.uk/news/2015/11/19/longest-999-fireresponse-times-20-years-government-admits, accessed on August 30, 2017
11 https://www.theguardian.com/us-news/2017/jul/15/honolulu-firemore- than-60-firefighters-tackle-blaze-at-high-rise-building, accessed on August 25, 2017
12 http://edition.cnn.com/2017/07/14/us/honolulu-condo-fire/index.html, accessed on August 22, 2017
13 https://www.thenational.ae/uae/dubai-hotel-s-sprinklers-ran-out-ofwater-15-minutes-into-fire-1.207750, accessed August 23, 2017
14 http://www.bbc.co.uk/news/uk-england-40293035, accessed on August 22, 2017
15 https://www.rt.com/news/260125-azerbaijan-building-fire-fatal/, accessed on August 22, 2017
16 Genco, G., Lacrosse Building Fire, 673 La Trobe Street, Docklands on 25 November 2014, Municipal Building Surveyor, City of Melbourne, April 2015
17 White, N., and Delichatsios, M., “Fire Hazards of Exterior Wall Assemblies Containing Combustible Components.” Fire Protection Research Foundation, NFPA, Quincy, MA, 2015
18 https://www.clydeco.com/insight/article/the-uaes-hotlyanticipated-new-fire-code-a-change-is-nigh, accessed on August 25, 2017
19 https://www.theguardian.com/uk-news/2017/jul/28/ government-announces-independent-review-building-regulationsgrenfell-tower-fire, accessed on August 25, 2017
20 https://www.theatlantic.com/news/archive/2017/07/honolulufire/533796/, accessed on August 25, 2017
21 Approval Standard 4880, Class 1 Fire Rating of Insulated Wall or Wall and Roof/Ceiling Panels, Interior Finish Materials or Coatings, and Exterior Wall Systems, FM Global, Johnston, RI.
22 Approval Standard 4411, Cavity Walls and Rainscreens, FM Global, Johnston, RI.
23 Paving the Road Forward for Our Clients, FM Global InternationalCodes and Standards 2016 Report, Publication #P17004, FM Global, Johnston, RI, 2017.