Built up felt roofing systems

	Specialist Flat Roof Contractors in London and the South East since 1973

Knight Asphalte is helping to sponsor The World Green Roof Congress in London on September 17th – 18th. To book a place visit -

www.worldgreenroofcongress.com

Knight Asphalte Co. Ltd
Old Goods Yard
Station Road
Lenham
Maidstone
Kent ME17 2HR
Tel: 01622 850648 Fax: 01622 850698
Email: mail@knightasphalte.co.uk

Felt roofing systems

Roll and pour or torch on felts are used in built up felt roofing systems, providing a strong, waterproof and fatigue resistent surface. Waterproofing and durability qualities are similar to those of asphalt products but their use is sometimes preferable on lighterweight decks.

There are many different approaches to the detailed design of a built up roofing system. These can be discussed with our our estimators.

High performance felts are commonly used nowadays as these provide premium long term durability.

Knight Asphalte are approved installers for Icopal, Ruberoid, Langley, Axter, Bauder, Suprima, Esha and Marley felts.

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What are SBS and APP felts?

Both SBS (Styrene Butadiene Styrene) and APP (Atactic Polypropylene) are polymers which are added to the basic bitumen material to modify it's properties. SBS makes the bitumen more rubber like, which gives it greater flexibility at low termparatures and greater elasticity. Adding APP to bitumen improves it's high temperature performance and can give improved weathering characteristics.