When roofing with an open flame

a gas burner is used.

It produces long flames and

can easily start a fire

in materials nearby,

or lead warmth

through cavities, ducts and so on.

This is especially dangerous in older buildings

where isolation often consists of

wood shavings, newspapers or other material

that can easily ignite.

Metal can also lead warmth

and start a fire at a completely different

place than on the roof.

Therefore you should bring tools

you can use to remove planks and tiles with,

since these places are difficult to reach.

Roofing with an open flame is also

regulated in the safety regulation:

It is prohibitied to use open flame

on lined and ventilated wooden roofs.

On compact roofs open flame is permitted

if flammable insulation is protected with

at least 30 mm non-combustible insulation.

There must be a safety distance of 60 cm

to parapet, cornice, ducts and so on

if thes consist of combustible material.

Hot air is a lot safer than

open flames.

Here the warm gas and air is

shielded in a chamber.

The biggest risk with this equipment

is that it produces a lot of carbon dioxide

that displaces the oxygen.

When you are done and turn off the equipment

oxygen-rich air rushes back,

which can lead to ignition.

Roofing can also be done with hot bitumen.

Gas-fired bitumen boilers are used

in order to heat the asphalt to 200 degrees celcius.

Here the bitumen boiler is the main risk,

not the roofing.

It can overheat,

causing the bitumen to ignite.

Or warm bitumen can spray out of the boiler.

When using a bitumen boiler you must follow these rules:

The bitumen boiler must be placed on a non-combustible

and level base,

for example in a vessel,

that can hold at least half of the

content in the boiler and is at least

30 cm wider than the boiler on all sides.

The boiler must always be placed

where it cause the least possible risk

if it overheats or tips over.

The boiler must be supervised at all times.

Flammable material in the vicinity must be removed.

On sloping grounds the boiler must be at least

15 meters from flammable material.

And at least 5 meters from

buildings in non-combustible materials.

Gas cylinders must be placed at

least 5 metes from the boiler.

Fire in a boiler must

never be put out with water.

If water comes in contact with

the burning bitument,

it can be thrown out of the boiler

with great power.