WEBVTT 00:00:00.322 --> 00:00:02.499 When roofing with an open flame 00:00:02.499 --> 00:00:04.902 a gas burner is used. 00:00:04.902 --> 00:00:06.184 It produces long flames and 00:00:06.184 --> 00:00:07.548 can easily start a fire 00:00:07.548 --> 00:00:09.317 in materials nearby, 00:00:09.317 --> 00:00:10.753 or lead warmth 00:00:10.753 --> 00:00:12.833 through cavities, ducts and so on. 00:00:14.934 --> 00:00:17.538 This is especially dangerous in older buildings 00:00:17.538 --> 00:00:19.710 where isolation often consists of 00:00:19.710 --> 00:00:22.547 wood shavings, newspapers or other material 00:00:22.547 --> 00:00:24.095 that can easily ignite. 00:00:24.839 --> 00:00:26.989 Metal can also lead warmth 00:00:26.989 --> 00:00:29.540 and start a fire at a completely different 00:00:29.540 --> 00:00:31.060 place than on the roof. 00:00:31.524 --> 00:00:32.897 Therefore you should bring tools 00:00:32.897 --> 00:00:35.145 you can use to remove planks and tiles with, 00:00:35.145 --> 00:00:37.590 since these places are difficult to reach. 00:00:38.854 --> 00:00:40.584 Roofing with an open flame is also 00:00:40.584 --> 00:00:42.442 regulated in the safety regulation: 00:00:43.394 --> 00:00:45.163 It is prohibitied to use open flame 00:00:45.163 --> 00:00:47.595 on lined and ventilated wooden roofs. 00:00:48.535 --> 00:00:50.852 On compact roofs open flame is permitted 00:00:50.852 --> 00:00:52.888 if flammable insulation is protected with 00:00:52.888 --> 00:00:55.989 at least 30 mm non-combustible insulation. 00:00:57.240 --> 00:00:59.941 There must be a safety distance of 60 cm 00:00:59.941 --> 00:01:03.397 to parapet, cornice, ducts and so on 00:01:03.397 --> 00:01:05.854 if thes consist of combustible material. 00:01:06.794 --> 00:01:09.082 Hot air is a lot safer than 00:01:09.082 --> 00:01:10.342 open flames. 00:01:10.775 --> 00:01:12.263 Here the warm gas and air is 00:01:12.263 --> 00:01:13.916 shielded in a chamber. 00:01:13.916 --> 00:01:15.885 The biggest risk with this equipment 00:01:15.885 --> 00:01:18.584 is that it produces a lot of carbon dioxide 00:01:18.584 --> 00:01:19.896 that displaces the oxygen. 00:01:20.506 --> 00:01:22.629 When you are done and turn off the equipment 00:01:22.629 --> 00:01:24.165 oxygen-rich air rushes back, 00:01:24.165 --> 00:01:27.594 which can lead to ignition. 00:01:29.188 --> 00:01:32.107 Roofing can also be done with hot bitumen. 00:01:32.107 --> 00:01:34.369 Gas-fired bitumen boilers are used 00:01:34.369 --> 00:01:36.875 in order to heat the asphalt to 200 degrees celcius. 00:01:36.875 --> 00:01:39.135 Here the bitumen boiler is the main risk, 00:01:39.135 --> 00:01:40.720 not the roofing. 00:01:41.074 --> 00:01:42.456 It can overheat, 00:01:42.456 --> 00:01:44.000 causing the bitumen to ignite. 00:01:44.000 --> 00:01:46.909 Or warm bitumen can spray out of the boiler. 00:01:48.429 --> 00:01:51.848 When using a bitumen boiler you must follow these rules: 00:01:52.838 --> 00:01:54.850 The bitumen boiler must be placed on a non-combustible 00:01:54.850 --> 00:01:56.046 and level base, 00:01:56.046 --> 00:01:57.386 for example in a vessel, 00:01:57.386 --> 00:01:58.903 that can hold at least half of the 00:01:58.903 --> 00:02:00.455 content in the boiler and is at least 00:02:00.455 --> 00:02:03.326 30 cm wider than the boiler on all sides. 00:02:04.143 --> 00:02:05.460 The boiler must always be placed 00:02:05.460 --> 00:02:07.432 where it cause the least possible risk 00:02:07.432 --> 00:02:09.639 if it overheats or tips over. 00:02:10.457 --> 00:02:13.240 The boiler must be supervised at all times. 00:02:14.460 --> 00:02:16.997 Flammable material in the vicinity must be removed. 00:02:18.254 --> 00:02:20.610 On sloping grounds the boiler must be at least 00:02:20.610 --> 00:02:23.090 15 meters from flammable material. 00:02:24.040 --> 00:02:26.492 And at least 5 meters from 00:02:26.492 --> 00:02:29.368 buildings in non-combustible materials. 00:02:30.462 --> 00:02:32.022 Gas cylinders must be placed at 00:02:32.022 --> 00:02:34.231 least 5 metes from the boiler. 00:02:35.509 --> 00:02:36.717 Fire in a boiler must 00:02:36.717 --> 00:02:38.362 never be put out with water. 00:02:38.362 --> 00:02:39.634 If water comes in contact with 00:02:39.634 --> 00:02:40.738 the burning bitument, 00:02:40.738 --> 00:02:42.679 it can be thrown out of the boiler 00:02:42.679 --> 00:02:44.671 with great power.