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Flat
Roofs
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WHAT IS ROOFING FELT?
Roofing felt is a term describing a roll of a base material which is
impregnated and coated with bitumen or modified bitumen. High
performance felt has a polyester base material which doesn't split and
is impregnated in modified bitumen.
APPLICATION OF FELT
There are 2 main methods of applying felt;The first and original method is "Pour & Roll". This is where bitumen is
melted in a bitumen boiler, often called a pot, then using a ladel put
into pouring cans ready to be poured onto
the roof surface so that the
felt can be rolled into the flood of bitumen.
The second method is "Torch-on". The felt is manufactured with a layer
of modified bitumen applied to the underside of the felt, this is heated
up and melted using a gas torch to form a "flood" of bitumen at the base
of the roll just like pour & roll.
SURFACE FINISH
The bitumen on roofing felt should be protected from UV rays to prevent
it from cracking. This protection is usually provided using mineral
surfaced felt which is available in a range of different colours.
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