b'FIRE SAFETYcontribute to fire. The possibility of such fuel to be ignited and develop a fire was confirmed by small green roof fires that happenedinPortland,Ore.,London, U.K. and Montreal, Que. in 2018. From the available information and reports on thosecases,sparksigniteddriedover-grown grasses. Inthe Montrealfire, a cigarette butt in a planter was the source of ignition, and fire spread over the roof deck and nearby wall. In all cases, the fireswereextinguishedbyfirefighters and caused no great damage. AsstudiesontheflammabilityofVisible aggregates in green roof substrate.green roof materials are difficult to find, it became clear that this should be the thirdinstallmentofMs.Gerzhovas doctoral research. Some data on green roof substrate properties can be found in the British report (2013). Soil blend in completely dry condition was tested in order to assess the worst-case scenario. Comparison with a substrate containing someamountofmoisture,asinreal conditions,canprovideabetteridea of the fire hazard of this component, whichwasexploredinthisresearch. Another contributor to fire is vegetation, specifically grass, leaves, small branches and dead plant material. These particles can easily catch fire, especially grasses, havinghighsurface-area-to-volume ratio.Theamountoffuelloadthey present, however, may not be sufficient enoughtodevelopandsupportlarge fires. Also, moisture contained in these particles reduces the availability of fuel, meaning that they can act as a heat sinkON THE JOB EARLY.rather than a source of fuel. WORKING LATE.TheobjectiveofthisstudywastoJUST LIKE YOU.determinethepotentialamountofThe construction industry is demanding. The days fuel that a green roof presents, and toare long and the competition is fierce. Thats why we keep the same hours as you do, and back you up with examine the Heat Release Rate (HRR,a full range of products, accessories and tools.therateatwhichenergyisgener- Top brands, experienced, knowledgeable atedduringmaterialcombustion)staff and extended hours make us the producedbysubstrateandvegetationtrusted choice.incomparisonwithatypicalbitumenAfter all, you work hard to exceed your roof covering. customers expectations, and so do we.Figure5showsacomparisonof existingdataonHRRofvegetation andbitumenroofmembranes.ItisWE DELIVER.seen that HRR of plant material, both liveanddead,increasesrapidlyintheROOFINGINSULATIONWATERPROOFINGfirstminute,reachinghighvalues.InABBOTSFORD, BC-Tel: 778.757.3332-Fax: 604.850.1040 WINNIPEG, MB -Tel: 204.333.6587SURREY, BC CHILLIWACK, BC MAPLERIDGE, BC PENTICTON, BC KELOWNA, BC VICTORIA, BC CALGARY, AB EDMONTON, ABthe second minute, however, it rapidlyTel: 604.596.3787 Tel: 604.795.7355 Tel: 604.463.4553 Tel: 250.770.2270 Tel: 250.765.3787 Tel: 250.652.8801 Tel: 403.262.1008 Tel: 780.454.1008decreases to about 30 kW/mmuchfax: 604.596.4559 fax: 604.792.2355 fax: 604.463.1298 fax: 250.770.2271 fax: 250.765.2271 fax: 250.652.8803 fax: 403.262.1018 fax: 780.454.1018www.rcabc.orgl27'