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When roofing with an open flame

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a gas burner is used.

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It produces long flames and

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can easily start a fire

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in materials nearby,

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or lead warmth

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through cavities, ducts and so on.

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This is especially dangerous in older buildings

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where isolation often consists of

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wood shavings, newspapers or other material

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that can easily ignite.

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Metal can also lead warmth

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and start a fire at a completely different

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place than on the roof.

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Therefore you should bring tools

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you can use to remove planks and tiles with,

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since these places are difficult to reach.

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Roofing with an open flame is also

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regulated in the safety regulation:

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It is prohibitied to use open flame

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on lined and ventilated wooden roofs.

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On compact roofs open flame is permitted

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if flammable insulation is protected with

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at least 30 mm non-combustible insulation.

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There must be a safety distance of 60 cm

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to parapet, cornice, ducts and so on

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if thes consist of combustible material.

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Hot air is a lot safer than

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open flames.

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Here the warm gas and air is

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shielded in a chamber.

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The biggest risk with this equipment

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is that it produces a lot of carbon dioxide

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that displaces the oxygen.

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When you are done and turn off the equipment

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oxygen-rich air rushes back,

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which can lead to ignition.

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Roofing can also be done with hot bitumen.

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Gas-fired bitumen boilers are used

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in order to heat the asphalt to 200 degrees celcius.

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Here the bitumen boiler is the main risk,

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not the roofing.

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It can overheat,

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causing the bitumen to ignite.

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Or warm bitumen can spray out of the boiler.

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When using a bitumen boiler you must follow these rules:

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The bitumen boiler must be placed on a non-combustible

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and level base,

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for example in a vessel,

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that can hold at least half of the

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content in the boiler and is at least

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30 cm wider than the boiler on all sides.

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The boiler must always be placed

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where it cause the least possible risk

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if it overheats or tips over.

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The boiler must be supervised at all times.

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Flammable material in the vicinity must be removed.

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On sloping grounds the boiler must be at least

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15 meters from flammable material.

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And at least 5 meters from

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buildings in non-combustible materials.

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Gas cylinders must be placed at

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least 5 metes from the boiler.

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Fire in a boiler must

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never be put out with water.

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If water comes in contact with

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the burning bitument,

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it can be thrown out of the boiler

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with great power.