Flat Roofing in Orpington

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 ladle 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.

The three layer systems we are installing these days will last for 40/50 years.

For more details please visit our Flat Roofs page.