Reinforced Bitumen Membranes
Reinforced bitumen membranes (RBM) is the ideal choice for both new build and refurbishment projects. RBM performs excellently over all types of roof decks and insulations. It is also referred to as elastomeric reinforced bitumen membrane (RBM). It was most commonly known as roofing felt.
In the past, roofing felt used to be made by saturating a rag fibre with bitumen. The strength of this material was poor and the bitumen became brittle with age. The felt used to be laid in three layers, also without a high value insulation beneath the felt. Later improvements have now been made by using glass fibre and polyester reinforcements in place of the rag. These generally performed better but the bitumen still became brittle. They were no match for lighter building designs which also required materials with flexibility and elasticity.
Insulation used to used more and more during the 1980’s. Bitumen waterproofing systems quickly became popular. Effectively, the insulation was laid directly beneath the waterproofing and over a vapour control layer. This system is now common place and is referred to as a ‘warm roof’. In conclusion a new type of bitumen product is needed.
Next generation Reinforced Bitumen Membranes
Today’s new generation of Reinforced Bitumen Roofing membranes are completely different and perform excellently. Therefore we ensure they are designed to meet the requirements of lightweight construction. The ever increasing thickness of insulation which brings very high temperatures to the roof surface.
The reinforcements are still mainly glass fibre and polyester. The bitumen compound uses a synthetic rubber material. This material is called Styrene Butadiene Styrene (SBS). This rubber ensures that the bitumen does not become brittle with age. Also, it provides a high degree of elasticity, even at sub zero temperatures. These high performing materials have excellent properties. The rapid aging and early failure of the old style felt roofing, is now a thing of the past.
- Materials with around 15% SBS rubber content are tough, robust, long lasting. This will suit all types of construction including lightweight building.
- The material will laid by our experienced fixers
- We are trained and qualified as required by the Manufacturers.
- Under these controlled conditions, insurance backed guarantees of 20 – 25 years are readily available although the life expectancy of a well laid, properly designed system should perform, trouble free, for 40 plus years.
Old style Felt roofing
Felt roofing with standard unmodified bitumen or with a very low percentage of rubber content, is only suitable for garden shed roofs. DIY warehouse stores and builders merchants usually sell this type of material. Many people refer to this as ‘Shed Felt’. In the modern era of flat roofing, this material is unsuitable for anything else. Reinforced Bitumen Membranes for; Southend, Chelmsford, Maldon, Rochford, Rayleigh, Shoeburyness, Leigh on Sea, Westcliff, Canvey, Braintree, Basildon, Brentwood, Burnham on Crouch, Epping, Ongar, Colchester, Witham and Tiptree